Moderator note: you can find a document detailing which versions of the app work on GrapheneOS here, maintained by @lbschenkel:

https://gist.github.com/lbschenkel/4199be415f2a139b64688ae74c92a7fc

Pixel 6
GrapheneOS TP1A.221005.002.2022102600
MitID version 2.3.4 (version code 55)

MitID is the official authentication app in Denmark. It is used to authenticate against all government services, banks, and other private websites. It is basically indispensable and you cannot do anything digitally in Denmark without it.

I tried to open MitID app today and now it refuses to work and displays the following message:

Device is Rooted.

We have detected that your OS is rooted. Remove root to continue.

The app has been working fine until now. I don't remember when I last used it, but it must have been 4-5 days ago. The problem is that in the last 24 hours both the app and GrapheneOS got updated so I do not know which update resulted in the app stopping working.

Naturally the phone does not have root. Either the app is detecting something else, or it's now enforcing attestation.

Can anybody that has not yet updated GrapheneOS to TP1A.221005.002.2022102600 check if you can install https://play.google.com/store/apps/details?id=dk.mitid.app.android and if it shows the message above when opened? No account needed, all you need is to open the app and wait a few seconds. If you don't see the message above but the welcome screen then the check passed and the regression is in GrapheneOS.

I am really hoping that this is a regression in GrapheneOS (maybe GmsCompat) that can be addressed because if this app no longer works it will be a deal-breaker for me and most users in Denmark.