Why can’t I sign in to my iCloud email

See the article If you can't connect or sign in to iCloud - Apple Support

What happens or doesn’t happen, what (else) have you tried, and what messages or diagnostics are shown?

If you have an add-in security app or an add-on VPN app, remove that, restart the iPhone, and try again.

Try restarting the iPhone.

V3r0nic41 Said:

"Why can’t I sign in to my iCloud email: Why can’t I sign in to my iCloud account?"

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Check iCloud Mail Direly:

What happens when you log in the iCloud Mail directly? Does that work? Try logging in here: https://www.icloud.com/mail