DeletedUser88 Installed from the Play Store. It could be that my number was also flagged at some point as a number that was using a third party client--I'm not sure. I just got the number so I don't know its history.

      TheAwesomenESQ when did you add your last account/new phone number? I only see the issue when trying to add my new number now, I can still use my old number without issue.

          emilycestmoi
          oh probably little over a year ago when the feature was first introduced. btw are you trying to add the new sim under add account? if i'm not mistaken, you need to activate the new sim via regular whatsapp setup (on a secondary device) before adding it as a new account. let me know how it goes. if not I'll try to remove/add the secondary number and see if I can replicate the issue.

            Yesterday I tried to register Whatsapp on my second GOS device with another number, got "we couldn't send you SMS". Owner profile without Goolag services, tried 2 phone numbers.

            emilycestmoi Can't reproduce. I installed WhatsApp from Play Store and proceeded to register a new account without any issues.

                emilycestmoi Try adding the number to another device first, then add it on your GrapheneOS device. If it still doesn't work then it's probably an issue with the number. Contact WhatsApp support in that case and explain it is a new number and is likely blocked.

                    DeletedUser88 have you tried the "add account" feature compared to just registering a new account?

                    But that feature is only visible if you're already registered and signed in? Anyone in this thread has got two phone numbers?

                      DeletedUser69 Both change number and add account with my new phone number both give the same error "need official whatsapp"

                        DeletedUser88 Yes I tried on an old Samsung phone with default Android, I am able to add my new phone number without the error. I did contact WhatsApp support, I'll post their reply here, essentially they are telling me that "Custom ROMs" are not supported.

                            So an update. I contacted WhatsApp support and they finally got back to me. Essentially I explained my issue but also mentioned I was using GrapheneOS on a Pixel 6 Pro. Their reply included "Custom ROMs...aren't supported":

                            Your attempt to register your phone number failed because you appear to be using an unofficial version of the WhatsApp app. We don’t support unofficial apps because they put your privacy and security at risk. They also put your data and device at the risk of malware.

                            Custom ROMs and rooted phones also aren't supported by WhatsApp, learn more in this article.

                            What to do next

                            1. Save your chat history.
                            2. Uninstall the unofficial app.
                            3. Download WhatsApp or the WhatsApp Business app from official app stores or our website.
                            4. Register your phone number.

                            If you see an error that the app isn’t available in your country, visit this page to download WhatsApp.

                            Need more help?

                            emilycestmoi Yes I tried on an old Samsung phone with default Android, I am able to add my new phone number without the error

                            that is very strange.

                            Does it still fail if you try on GrapheneOS again after you initially successfully logged in? I would also try a re-install from the Play Store, perhaps on a different profile? You could try the official WhatsApp APK too.

                                DeletedUser88 Yes, I've tried this already. Working on my old Samsung with default Samsung Android. I try to add the same number to my GrapheneOS WhatsApp install, error. I just did another fresh install directly from the Play store, same error. Maybe WhatsApp is just starting to roll this out? Going to try to get everyone to use Signal for now, so far the only way around it I've seen is to root and spoof the phone. Maybe spoofing is something GrapheneOS will have to add in the future?

                                    emilycestmoi Maybe WhatsApp is just starting to roll this out?

                                    This would be incredibly unfortunate.

                                    emilycestmoi Going to try to get everyone to use Signal for now,

                                    Good plan.

                                    emilycestmoi Maybe spoofing is something GrapheneOS will have to add in the future?

                                    GrapheneOS has stated they will not be spoofing Play Integrity API. They are taking a more concrete and long-term approach of talking to regulators in the EU to get Play Integrity banned.

                                          emilycestmoi Maybe spoofing is something GrapheneOS will have to add in the future?

                                          A key problem is that spoofing works only on the old-fashioned checks that Google is phasing out, not on the strong checks that banks are starting to use.

                                            Yes, it would be harmful if WhatsApp bans GrapheneOS. But personally – unless several more people are able to reproduce this eventually – it's not clear to me that this problem is due to an OS integrity check. The fact that a WhatsApp customer support representative – and their documentation – says that "custom ROMs" are not "supported", I think is equally likely to mean that WhatsApp simply does not provide customer/user support for people running aftermarket operating systems. It makes sense then that the CSR is following internal instructions and dismissing OP's support request.