I just implemented MFA corporate wide, and the authentication period is 5 days before users have to re-authenticate. All of my iPhone users do not get a notification or prompt to re-authenticate and their mail just stops coming through, almost all of the C-Suite have iPhones and this is becoming a huge issue. They all use the native mail app and it's the latest version.
iPhone SE, iOS 16
If you're experiencing issues with email flow stopping on your iPhone SE and suspect it may be related to Multi-Factor Authentication (MFA), here are some steps you can take to troubleshoot the issue:
Remove your email account and set it up again
Make sure that all of your emails are there or make sure that your email is saved somewhere other than your device. On your device, go to Settings > Mail, then tap Accounts. Tap the email account that you want to remove. Tap Delete Account.
If you can't receive email on your iPhone, iPad, or iPod touch ...
If you can't send an email on your iPhone, iPad or iPod touch
If you can't send an email on your iPhone, iPad or iPod touch ...
Which email account are you referring to? Google, iCloud, AOL, Exchange, Outlook, Yahoo or any Other (Refer to the pic )below
You may have enabled two step verification on Google --> Sign in with App Passwords - Google Account Help
You may have enabled Authenticator for Yahoo --> Generate and manage third-party app passwords | Yahoo Help
You may have enbled 2-step verification for Outlook --> Manage app passwords for two-step verification
You may have activate 2-step verification for Aol --> Create and manage third-party app passwords - AOL Help
No notification to reauthenticate due to MFA, email stops flowing in.
