Wondering if you have installed the latest update (iOS 16.2) on your iPhone:
About iOS 16 Updates
If your phone's iOS has been updated, yet isn't working right, you might want to try restarting it.
(Sometimes that can put things back in order.)
How to: Restart your iPhone - Apple Support
OR
If your account is disabled (eg: for security reasons)
What to do: If your Apple ID is locked or disabled - Apple Support
Else:
You can check to make sure you are currently signed in to your iPhone with your Apple ID:
Sign in with your Apple ID - Apple Support
If you still have difficulty ... you could try signing in to your Apple ID account online:
Apple ID Log-in:
https://appleid.apple.com/
For more support if needed:
You might want to reach out to the Apple ID Support Team:
There is a "Get Support" link at the bottom of their webpage:( link below)
Apple ID - Official Apple Support
All the best :-)