Using Outlook for iOS for personal email and calendar management
Hi!
The accounts are also saved on the mobile device itself, under Settings. You need to delete the accounts from there.
- Old accounts—and even iCloud accounts or others carried over from a phone migration—can cause issues in Outlook.
- First, sign out of your account in the Outlook app.
- Open your iPhone's Settings > Look for the Accounts, Accounts & Sync, or similar option > Find your Hotmail or Microsoft account > Remove the account.
https://support.apple.com/en-us/guide/iphone/iph44d1ae58a/ios
- Uninstall Outlook (See link below) > Restart your iPhone > Reinstall it from the Apple Store.
https://support.apple.com/en-us/guide/iphone/iph248b543ca/ios
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