Using Outlook for Android for personal email and calendar management
Greetings!
This is Tin, I'll do my best to help. Looks like you want to sign out your account on other device and just leave it sign in on specific device which is your mobile phone poko. Let me assist you.
Please go to https://go.microsoft.com/fwlink/?linkid=2253707
Sign in your MS Account and hit Sign out everywhere and select Sign out.
For your reference: https://support.microsoft.com/en-us/account-billing/how-to-sign-out-of-your-microsoft-account-everywhere-58da4a74-a719-43a6-9dd0-74a7e613229f
Thank you.
Tin