.

I moved this from the Android Apps forum to the Note9 forum, since the former is intended for developers to promote their apps.

Go to Settings>Apps, tap Menu>Show System, and then select the Phone app (if you don't see it, look for Dialer). Then look at its notifications there.
 
Had same problem with s9 after latest security update, went to apps/phone(if you show system apps you will find several "phone" apps), look for one that has notifications blocked. I could not unblock this setting so I cleared cache and data, restarted phone and all was good
 

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