Tldr, I can not log in into them it fails on the initial requests. Also, Android auto crashes my phone when I interact with the car screen.
Again, theses issues are not with /e/ they are with a stock fairphone. I just want to know things like this work on /e/ before I try switching to it because I am a contractor and I have talk with 3 different IT departments when I switch phones.
Full details:
Summary: Fairphone 5 – System-level incompatibility affecting Android Auto and Microsoft apps (Teams, Copilot, Phone Link)
Device: Fairphone 5
OS: Fairphone OS (Android 14/15, fully up to date)
Google Services: Present and fully updated
Account type: Microsoft work account (AAD / M365)
Affected applications / features
Microsoft Teams (Android app) – cannot sign in
Microsoft Copilot (Android app) – does not work
Windows Phone Link / Link to Windows – unreliable or non-functional
Android Auto – does not work
Microsoft Teams (Web / UWP via browser) – works
Observed behavior
Microsoft Teams Android app fails during sign-in with
“Sorry, but we’re having trouble signing you in.”
Failure occurs before password or MFA, indicating broker/auth failure rather than credential issues.
After a failed sign-in attempt, the Teams app enters a crash loop and will not reopen until app cache and storage are cleared.
Issue reproduces on a fresh Android Guest profile, ruling out user data or app-level corruption.
Microsoft Copilot shows similar failure behavior.
Android Auto fails on the same device.
Teams works correctly via browser / UWP, indicating the account and tenant are not the problem.
Troubleshooting already completed (exhaustive)
Android System WebView enabled and fully updated
Google Chrome enabled and updated (was previously disabled)
Google Play Services updated
Google Play System Update applied
OS fully up to date
Multiple reboots
App uninstall / reinstall (and cache + storage clear)
Tested on Guest account (clean profile)
All with no change in behavior.
Key diagnostic conclusions
Issue is not caused by:
Microsoft account or tenant configuration
Teams app cache or install state
Chrome / WebView being disabled
Google Play Services versioning
User profile corruption
The fact that:
Teams Android app fails
Copilot fails
Android Auto fails
Windows Phone Link is affected
Browser-based Microsoft apps work
strongly indicates a system-level failure involving hardware-backed security / device integrity.
Likely root cause (high confidence)
A compatibility or implementation issue in Fairphone OS’s hardware-backed security stack, likely involving one or more of:
Hardware-backed Android Keystore / Keymaster
StrongBox / TEE (Trusted Execution Environment)
Play Integrity API returning a non-MEETS_STRONG verdict
Attestation or encrypted key generation used by:
Microsoft Authentication Broker
Android Auto
Companion Device Services
Apps that rely on brokered authentication or device trust fail.
Apps using browser-based OAuth continue to work.