Affected app
Name: Dott
Package id: com.ridedott.rider

Describe the bug
Signing in or signing up fails, seemingly because of a firebase error

To Reproduce
Steps to reproduce the behavior:

1. get Dott
2. Click on sign up
3. enter phone number
4. click sign up

Expected behavior
sends sms verification or proceeds in general

Screenshots

System
Android Version: 15
Custom ROM: LineageOS+microg 22.1

microG
microG Core version: 0.3.6.244735
microG Self-Check results: All ticked

Additional context
full logcat of an app start and signup attempt, filtering out all logs, except those coming from com.ridedott.rider with personal or identifying information replaced by [...]:

dott 06_04-09-30-30_733.log

Likely critical lines from the log:

1743924520.834 10285 20276 23037 W LocalRequestInterceptor: Error getting App Check token; using placeholder token instead. Error: com.google.firebase.FirebaseException: Error returned from API. code: 403 body: App attestation failed.
1743924521.066 10285 20276 23037 E FirebaseAuth: [SmsRetrieverHelper] SMS verification code request failed: unknown status code: 17499 Firebase App Check token is invalid.
1743924521.067 10285 20276 20276 D FirebaseAuth: Invoking original failure callbacks after phone verification failure for (my phone number), error - An internal error has occurred. [ Firebase App Check token is invalid. ]

microg Google device registration is enabled, as is cloud messaging and "SafetyNet".
my device meets basic integrity and device integrity, uses sdk level 35

Possibly related: #1967, #1281