Using Outlook for Android in business environments for email and scheduling
Hi shawn in Seattle,
Welcome to Microsoft Community forum. It seems that you're also having the same issue on Outlook.com app prompting you to relogin. Please note that this issue is case to case basis for each user and that there are several factors that might caused such issue.
For investigation purposes, have you enabled the two-step verification on your account? If yes, you will need to have an app password to access your account when using a mail app from your mobile device. In order to rectify this issue, please create a new app password for your account. For more information, you can refer to this article: App passwords and two-step verification.
If issue persists, please confirm if issue also occurs on a different account on your Outlook.com app. Were you able to access your account using your phone's default mail app? Also, what is your mobile device type, name and its OS?
We're looking forward on your response. We appreciate your cooperation.
Thank you.