can't see apple airtag in my devices on iphone 7
Cannot connect my air tag to my iphone 7 even though I have installed iOS 15.77 (14.5 or later is required).
iPhone 7 Plus, iOS 15
... and what have you tried, so far yourself, to resolve this issue so that we don't offer potential solutions that may not have already worked for you?
For example, have you tried resetting this AIrTag?
Ref: How to reset your AirTag - Apple Support