New AppleID not working on iPad.
I changed my AppleID using the proper steps, but my iPad refuses to use the new ID, and keeps asking for the password of the old ID. How can I get my iPad to recognise the new ID.?
iPad, iPadOS 15
If you have changed your ID, have you followed the steps in this article? Make sure you turn off Find My Phone before signing out of the old ID. Once signed out and Find My Phone is off, then sign in with the new ID, then turn Find My Phone back on.
What to do after you change your Apple ID or password - Apple Support.