To reset the Outlook app on your iPhone, you can follow these steps:
Locate the Outlook app icon on your iPhone's home screen and press and hold it until all the icons start to jiggle.
Tap the small "x" icon on the top-left corner of the Outlook app icon. This will uninstall the app from your device.
A confirmation message will appear asking if you want to delete Outlook and all its data. If you want to completely reset the app, select "Delete" or "Remove."
Once the app is uninstalled, go to the App Store on your iPhone.
In the App Store, search for "Outlook" using the search bar at the bottom of the screen.
Locate the Outlook app from Microsoft Corporation and tap the "Get" or "Download" button next to it to reinstall the app.
Wait for the app to finish downloading and installing on your device.
After installation, locate the Outlook app on your home screen and open it.
Follow the prompts to sign in to your Outlook account using your email address and password.
Regards,
Peter