Eagle_Owl
Addendum:
Especially for you, I have now tested again and saved two more fingerprints in the owner profile only.
Result: The problem is back!

I then deleted the additional two fingerprints and tested them again.
Result: Everything works!

Conclusion: there must be the same number of fingerprints stored under all profiles or at most two per profile will work.

But I'm not going to test this any further. If one of you has already saved the same number and/or the same fingers per profile anyway and it doesn't work, we already have the answer: then only two fingers per profile are currently possible.

      Eagle_Owl

      Ohhhhh snap. I had five fingerprints in the main and five in the second profile. I deleted three in both profiles so left with two (math...)

      Still early, but it seems to be allowing the fingerprint unlocks now when switching...

      Holy crap, if this works...you freaking legend

        Eagle_Owl

        You are the king!
        My phone had limits for max 4 per finger and I used up all slots for both profiles.
        I deleted all and added
        3 in main + 1 in second
        That didnt work.

        I did 2 in main + 1 in second and it worked! This is the first time it starts to work for over 9 months!!
        I added 3 again i main, and it stopped working.
        So seems there is some sort of limitations here or bug when adding more than 2 prints per finger.

        Also I want to add when switched profile first time back to main it asked for my pw, but after that all attempts worked with fingerprint only.

        For a split second it shows lock symbol if you let it run the fingerprint sensor will show up. If not for whatever bugged reason just turn screen off and on (i have power button to instant lock phone enabled) and it does show up.

        I will report back again here in a day or two with my verdict :)

        BIG THANK YOU!

          Eagle_Owl
          It's amazing you figured this out. You should get a reward. lol. Thank you, thank you, thank you.

            After 5 hours of constant switch back and forth I can tell it still works fine with having just 2+1 prints added (should work same as 2+2 also). Also tested some reboots meanwhile.

            The only bad side-effect of being limited to 2 fingers per profile is due to the bad fingerprint reader of Pixel 7 (which has nothing to do with GOS), I used to add multiple configuration for same finger to have a 100% success rate unlocking the phone.
            With the limitation of just 2 fingers added (1x thumb and 1x index) I am now having difficulty of reader to scan my finger as my thumb now requires 2-3 attempts to unlock it. But I am still happy :) To have this resolved was the biggest inconvenience with gos ever.

            You should update the GOS bugtracker and maybe this can be fixed finally. All creds to @Eagle_Owl for the time you spent and finding a workable solution.

            Another thing I noticed now regarding this issue is that if you have too many incorrect attempts on one of the profiles with the fingerprint, then the fingerprint also gets disabled in the other profile (change profile through lockscreen) and it asks for pw there too. Once pw is is entered the fingerprint starts to work again.

            So somehow it seems some information regarding fingerprint configuration/settings or something else is shared among profiles hence the limit and workaround regarding the 2+2 fingers.
            If this helps any DEV.

            Unfortunately, this workaround only works partially for me. I have stored one fingerprint/profile (no more than four in total). If I switch back and forth between several active profiles, it works well.

            But if I exit a user profile via "end session" and switch to the owner profile (which is actively running in the background), the fingerprint icon only flashes briefly, but then disappears again and I have to enter the password again each time.

              Has anyone tried 5 prints in all profiles to see of that works too ?

              Murcielago
              What happens if you inside main profile start an app that can be configurated to use fingerprint to access app. For example bitwarden.
              Does everything start to work again?

                matchboxbananasynergy

                Eagle_Owl
                I tried two profiles with 5 prints and couldn't use finger print when switching profiles . went down to two prints and it works as it should . this is crazy .
                Should repot google , maybe a bounty ?
                I added more prints when my finger got disfigured must of been around that time it stopped working correctly .

                    It was a pleasure for me to help finding the reason for this bug.
                    I am very happy, that we all now have a workaround until Google or the GOS team will find a solution for the use of all fingers for all profiles.

                    Murcielago
                    Yes, I know, it works only if you don't end sessions of additional profiles.
                    Oh, no, wait, this was long time ago, when I have used two profiles until the issue began…
                    Have it tested right now, because you mentioned it and I was very curious if this issue is solved also…
                    And it works for me here on my Pixel 7 Pro!

                    I have selected my second profile and because it's a new session, I had to key in my password.
                    Then I have ended this session to go back to owner profile.
                    Here the fingerprint reader shoes me instantly the fingerprint symbol, not the lock symbol.
                    And now it works the first time I log in. :-)

                    Maybe you have to repeat the steps once more, until the device stores it all the right way?
                    Good luck!

                        Eagle_Owl yes it works correctly when ending a session or just switching . never did that before .

                          Eagle_Owl

                          I have just gone through the steps again and can confirm that it now works perfectly. I also tested how it behaves when some profiles have fingerprints and other passwords or PINs (also scrambled). This has also worked perfectly so far - both with switching profile and end session.

                          I'm really thrilled that this works - now I can finally create the profiles again the way I would actually like to - I had to adjust my setup due to the frequent entry of long passwords when switching profiles.

                            4 months later

                            Eagle_Owl Hello, I always had 1 fingerprint for each profile and I have the bug. So I don't think It's a question of having the same number of fingerprints per profile.

                              13 days later

                              On build 2024080600 this once again is fixed for me. No pin numbers drawn under fingerprint and the colors match the current profile. Awesome!!!

                              3 months later

                              There is another use case actually.
                              None of the above workarounds have worked reliably across all profiles.
                              But something is very consistent. I can go back and forth between 2 profiles with fingerprints. As soon as I auth on a third one, the first one then ask for a PIN.
                              It seems you can use a fingerprint only on the last 2 profiles being used.

                              Context:

                              • 5 profiles
                              • no passwords, only PINs on all profiles
                              • 2 fingerprints/profile, the same fingers
                              • Gesture navigation on all profiles
                              • Auto-confirm unlock enabled for all profiles
                              • Enhanced PIN privacy enabled for all profiles
                              • Lock after screen timeout: 5 seconds for all profiles
                              • Power button instantly locks disabled for all profiles
                              • Phone: Pixel 8
                              • Android version: 15
                              • Build number: 2024102100

                              The last setting (Power button instantly locks disabled) apparently impact the locking behaviour. If enabled, putting the phone on the couch and it locks automatically and ask for the PIN again.
                              I also have 'Private Lock' installed but I made sure it isn't triggered, sensitivity set to 18/40.

                              matchboxbananasynergy

                                2 months later

                                Hi, I have had the same issue: when switching from one of my additional profiles (still open/in session) back to the owner, I could not use biometrics and always had to enter my password.

                                This was already the vase with the first Android 15 stable build and stayed that way regardless of updates.

                                However, I was able to apply the following workaround, which was already mentioned here:
                                My owner had 4 fingerprints, while all my profiles had 2. I removed two of the fingerprints on the owner.
                                After this I could use biometrics with no issues.

                                Latest context in which I experienced the issue:

                                • mixed: pin and passwd
                                • 2 fingerprints/profile, the same fingers (except owner: 4 fingers)
                                • Gesture navigation on all profiles
                                • Enhanced PIN privacy was disabled
                                • Power button instantly locks enabled for all profiles
                                • Phone: Pixel 8 Pro
                                • Android version: 15
                                • Build number: 2024121200
                                2 months later

                                Getting the same and changing fingerprints to 2+2 seems to do the trick on a P8 with the latest updates.

                                What's odd though is that I had 3+1 and I believe it worked although I'm not 100% sure that I added the 3rd fingerprint of the owner profile before the last update(s). I first tried 3+3, did not work.

                                2+2 seems to be working.

                                Murcielago

                                This is weird, I'm getting the opposite. If I end the session of my secondary user, I can use fingerprint on the owner (even with > 2 fingerprints on the owner), but if I switch between both, I only can if I have 2+2.