sign in failed company outlook mobile app on honor magic V3

Screenshot_20250915_122021_com_microsoft_office_outlook_MAMStartupActivity.jpgI am unable to use Outlook, Teams, and Edge properly on my Honor Magic V3 personal device with my corporate Microsoft 365 account. Outlook works only temporarily after login (with OTP and PIN), then stops syncing and shows “Sign-in failed / Retry / contact your IT department.” My company IT confirmed it may be due to Microsoft not supporting Honor devices. Please confirm if Honor devices are unsupported and if there is any workaround.

Full Details:

Hello,

I am facing an issue with the Outlook mobile application on my device Honor Magic V3. This is my personal phone, but I use it to access my corporate email, which is licensed under Microsoft 365.

Here is what happens:

When I install the Outlook app and begin the login process with my company email, the app requires me to download the Intune Company Portal. My company IT team advised me not to open or sign in to Intune, so that the Outlook setup can complete normally.

• After entering my email and password, I proceed with the second step of authentication (OTP). Once I enter the OTP, the app then asks me to create or enter a PIN code for additional security.

Initially, everything works perfectly — the mailbox syncs correctly, I can send/receive emails, and I receive notifications.

However, this works only temporarily. After a short period, or whenever I exit the app, it completely stops syncing. I can no longer send or receive emails unless I uninstall and reinstall Outlook again.

When I re-open the app in this state, a small window appears that says: “Sign-in failed”, with an option to Retry. The message also says: “If the problem continues, contact your IT department.”

What I already tried (based on my company IT team’s guidance):

Cleared cache, cleared data, reinstalled the application multiple times.

Restarted the device, changed internet connection (Wi-Fi/Mobile Data).

Adjusted all settings related to background data, battery optimization, and app permissions.

Followed every troubleshooting step provided by IT.

Unfortunately, nothing worked. My IT department confirmed that the issue is related to Microsoft not supporting Honor devices for security reasons.

Additionally, Microsoft Teams and the Edge browser are also not functioning properly on my device, which makes me think the problem is broader than just Outlook.

Could you please confirm if Microsoft officially does not support Honor devices like Honor Magic V3? And if there is any workaround or upcoming support plan?

Thank you,