How do I find my Apple ID on a different phot but in the same account
forgot Apple ID or password on the second phone I had it for my cousin. What shall I do to help him out resetting
iPhone 8 Plus, iOS 14
See if you can recover the ID/password. Use every email address you can think of.
Apple ID - How to find your Apple An iCloud e-mail address is an Apple ID.
If you forgot the Apple ID password, enter the Apple (iCloud) ID, and click Forgot Password. See if you can get a Rescue or Notification email option if necessary. Link to contact Apple Support at the end of the 2nd article.