For some reason I’m not receiving emails

See the articles If iCloud Mail isn't working - Apple Support

If you have trouble receiving email in Mail on iCloud.com - Apple Support

Check available email storage in iCloud - Apple Support

If your iCloud mailbox is full - Apple Support

Mayito0o Said:

"For some reason I’m not receiving emails?"

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Use a New App Password:

Do you use an App Password? If so, try a new App Password. Sometimes, changes (i.e. updates) are made to the iPad, and then mail server syncing becomes an issue (which is what a new App Password it intended to fix). For example, go here for gmail: Sign in with App Passwords - Google Account Help - Google