Apple id

If you are seeing an Activation Lock, you  need the Apple ID and password that was used when the device was first set up. If you don’t know that, you can’t remove the Activation Lock.

If this is a used device, the previous owner needs to go to https://www.icloud.com/find/ and erase the device, then remove it from their account. If they won't do that, the device is useless. Apple won't unlock it.

Turn off Activation Lock - Apple Support.   *

If you are the original owner, contact Apple. Apple can remove the ID  if provided the required paperwork to include the original purchase receipt with the serial number on it. 

Request additional support for unlocking your device.    -

You used to be able to take the device, the original purchase receipt with the serial number, and a photo ID to the nearest Apple Store (if it has reopened) and have them remove the ID. This may have changed, so call the store before going to make sure they can help.

Genius Bar Reservation and Apple Support Options - Apple.   -

If your iPad is not associated with an Apple ID and you forgot the code to unlock the iPad, you will need to restore it to factory settings. This will remove all data from the device.

Because you do not get into your iPad and reset it, you will need a Mac or a PC with iTunes.

You can read here how to make a Factory Restore:

Hvis din iPhone ikke kan tændes eller er frossen - Apple-support (DK)