Activation Locked, Incorrect Apple ID or Password
I bought a used I Pad 4 , and was able to set up my Apple ID on it, used it OK for a few day.
I was going to give it to my friend, reset it, and deleted from my I Cloud my devices.
When I wanted to sign it again, using my same Apple ID & Password, to show my friend, it kept saying INCORRECT APPLE ID OR PASSWORD.
Even though I turned off for a day, and tried again..... same error.
iPad, iPadOS 15