I asked a developer in Denmark to test this out and he reported that on Linux Desktop Chromium, if you fully disable the User Agent Client Hints ( see here how: https://www.chromium.org/updates/ua-ch/ ), MitID works for in the browser.

Firefox does not support the sec-ch-ua-* headers, so apparently I believe that MitID either test if there is support for the Accept-CH request or API support in Javascript and if there is it also expects the high entropy client hints.

You can read more about this here:
https://browserleaks.com/client-hints
https://developer.chrome.com/docs/privacy-security/user-agent-client-hints
https://developer.mozilla.org/en-US/docs/Web/HTTP/Client_hints#user-agent_client_hints

18 days later

I'm not so good in English. Iam a graphenos user living in Denmark, can somebody danish speaking help me to use mitid on pixel 7a?

14 days later

FYI: latest version of Vanadium (121.0.6167.101.0, alpha channel as I write this) works again with MitID: the authentication form no longer closes prematurely.

This confirms that the problem was indeed the client-side hints. MitID expected them to be there, which Vanadium didn't send. This latest version sends spoofed values, which are enough to satisfy MitID.

    lbschenkel I am still not able to install the version you are referring to but I will check later.
    Thank you for shearing the important news!

      I can confirm it works!
      Donation deserved

      8 days later

      MitID has seemed to stop working for me (asks me to scan a QR code when its a login on my phone)
      Im on:
      Pixel 8
      GOS Ver: UQ1A.240105.004.2024012600 (latest as of 1 feb 2024)
      MitID Ver: 3.2.3 (latest as of 1 feb 2024)
      Ive tried logging in with brave, chrome and vanadium which all gives me the same results.

      I see that GOS ver 2024011600 works, but i dont know how to roll back to that version - if someone could tell me, that would (hopefully) fix my problem.

        donovxn The problem is not with GrapheneOS nor Vanadium.

        The following message is on mitid.dk right now:

        Android users may be prompted to scan a QR code on the same device as MitID app. We are working on a solution. It is possible to use another device, Eg. PC or tablet, to login

            When I tried to login with MitID ,after clicking open the app I was not prompted with insert the password and no qr code.

              lbschenkel

              Thanks, i was thinking it was an app issue too since there were a lot of negative reviews the past week with the exact same issue that I had. Pretty insane that this is the case tho...

                Grkrz Can you explain further? I dont quite understand your issue.

                  donovxn The message from mitid.dk has disappeared and I was able to log-in, so... yes? Didn't you try yourself?

                    My MitID app doesn't work on my main profile (no GSF and SPS installed). When I try to sign-in with MitID from my PC and open my MitID app on my phone it never receives the request to authenticate the session. It just stays on the "Ready to use" screen for about one minute and then crashes.

                    Does anyone have any ideas to thinks i coul'd / shoul'd try.

                    MitID is installed with the following settings:

                    Allowed permissions:
                    • Camera
                    • Network
                    • Notifications
                    • Sensors
                    Not Allowed:
                    • Phone
                    Other settings:

                    Alarms & reminders: Not allowed
                    Exploit protection compatibility mode: Enabled
                    Hardened memmory allocator: Disabled
                    Native Code debugging: Allowed

                    Phone: Pixel 7
                    GOS version: 2024012600
                    MitID version: 3.2.3

                    15 days later

                    And there's a new version of MitID in the Play Store: 3.3.1. Do we have any volunteers that are willing to risk their installation and upgrade to this version? Please report your findings.

                      lbschenkel I just updated to 3.3.1 and hence my post above yours, I still hare trouble getting MitID to work in my main profile without Google Play.

                      In my second profile with google play services, MitID version 3.3.1 works.

                      Vanadium: 122.0.6261.43.0
                      GOS: 2024020500

                      Update: Actually it seems that 3.3.1 partially solves my problem in my non-GSF profile. Now I can at least approve login requests made from another device. Still no luck with login requests made from vanadium though.

                          I upgraded mine to 3.3.1 and I can confirm that authentication is working when using either Vanadium or Firefox.
                          Updated gist.

                          trilogy6202 I never attempted to use MitID without Play Services, so I can't really help. Another user did try and it looked like Play Services was only needed for activation, and not authentication, but it's also possible that things have changed since then or there will be bugs due to being an unsupported/untested configuration (from MitID perspective).

                              lbschenkel This is still true. I installed GPS to make MitID work, then after signup, I uninstalled GPS and the app works for authentication. Last time i updated the app though, with GPS installed, it broke the app.

                              So my conclusion from tests are that GPS is needed for initial launch/after update - but not in general use
                              The jump from web to app though does only work sometimes, which is why it makes sense to set method to numbers instead of QR code

                              Hope this helps