Email frozen on iPhone 7

Start here, If you can't receive email on your iPhone, iPad, or iPod touch - Apple Support If that does not help, come back with more information, such as any error messages and what other troubleshooting you have tried.

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luther273 Said:

"Email frozen on iPhone 7: How to receive emails on my iPhone"

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Use a New App Password:

Try creating a new App Password. Your App Password may need to resync - something typical after update installations. As an example for a gmail account, you would log in using that password, rather than your Gmail password. See if it then works. Go Here: Sign in with App Passwords - Google Account Help - Google