Speak to customer service
I have a iPad that has an activation lock. It is saying incorrect Apple ID I don’t remember the Apple ID I set it up with
Here is a link to Apple's page about Activation Lock:
https://al-support.apple.com/#/getsupport
If you forgot your Apple ID - Apple Support
If you forgot your Apple ID password - Apple Support
If you were the original purchaser and can prove it with
a receipt from Apple or Apple-authorized iPad retailer showing
the serial number of the iPad, make a genius bar
reservation and bring in the receipt, iPad, and government
issued photo ID to Apple and they may assist in resolving the problem.
If the iPad was purchased used or there is no receipt, the AppleID and passcode must be recovered
It is highly recommended that you make a Genius Bar Reservation to avoid delays at the Apple store
Genius Bar Reservation and Apple Support Options - Apple