Why I can’t find my AirPods Pro serial number on my iphone?

Greetings, Meijun22!

Thanks for reaching out to the Apple Support Communities! It sounds like your serial number is missing from the Settings on your iPhone for the AirPods Pro. Check out this article to Reset your AirPods, then reconnect the AirPods to your iPhone and check to see if the issue is still going on.

You can also check out this article to Find the serial number of your AirPods for additional steps you can take to locate the serial number for your AirPods Pro.

Take care!