E mails not working on iphone 17 after installing authenticator app

This is usually an account re-authentication issue in iOS Mail after Outlook/Hotmail sign-in changes, or the account may need to be added back using modern authentication.

Try these steps in order:

1. On the iPhone, open Settings > Mail > Accounts.
2. Tap the Outlook/Hotmail account.
3. If shown, tap Account Settings or the Password field.
4. Enter the correct current password, then tap Done.
5. Open the Mail app and check whether mail sync resumes.

If the account still shows Account not authenticated, or Mail shows Cannot Get Mail – The connection to the server failed, remove and re-add the account as Outlook.com:

1. Go to Settings > Mail > Accounts.
2. Tap the affected email account, then tap Delete Account.
3. Go back to Settings > Mail > Accounts > Add Account.
4. Choose Outlook.com and complete sign-in.

If removing and re-adding still does not fix it:

1. Remove the account again.
2. Go to Settings > Safari and tap Clear History and Website Data.
3. Reboot the iPhone.
4. Add the account back through Settings > Mail > Accounts > Add Account > Outlook.com.

If sign-in fails with Microsoft account prompts such as incorrect password, too many sign-in attempts, or verification code issues, recover account access first, then sign in again in Mail.

If the problem is only in the iPhone Mail app and Outlook works on a computer, the issue may be with the email app. In that case, using the Outlook mobile app is recommended.

References:

• iOS & iPadOS users may experience issues accessing their Outlook and Hotmail accounts from the iOS/iPadOS default Mail app
• Modern Authentication Methods now needed to continue syncing Outlook Email in non-Microsoft email apps
• Troubleshoot Outlook mobile issues