Since Outlook works fine on your laptop and the problem is only on the Android app, it sounds more like an app issue than an account problem.
First, completely close Outlook and reopen it, then check the Play Store for an update. If it still only flickers when you tap an email, try Outlook > Settings > select your email account > Reset Account. Microsoft recommends this when the mobile app is showing incorrect or incomplete behavior.
If that still doesn't work, you can also use Profile picture > ? > Contact Outlook Mobile Support directly from the Android app.
Since even old and sent emails won't open, you should try the account reset before removing and reinstalling the app.