2nd hand Ipad pro locked

the activation lock is not really on

the ipad it's a theft protection measure on apples servers

it needs to be removed

How to remove Activation Lock - Apple Support

if you don't know the appleID

Recover Your Apple ID - Apple

if that does not help you then you

need the assistance of apple

Additional Support - Activation Lock (apple.com) and or

Get Support (apple.com) , Genius Bar Reservation and Apple Support Options - Apple

The iPad is useless to you.

Here are the Apple support pages that outline the Activation Lock - and the only mechanisms by which it can be turned off:

Activation Lock for iPhone, iPad, and iPod touch - Apple Support

Turn off Activation Lock – Apple Support

As you will discover, unless you are the owner of the AppleID that was last used to activate the device, you’ll not be able to defeat or bypass the Activation Lock. With documentary evidence that you are the original owner (such as sales receipt showing the serial number), Apple may be prepared to assist - otherwise they and nobody here will be able to help you.

The All Too Common SAD Reality of Buying … - Apple Community

You purchased a completely useless device to you.

The lock cannot be circumvented.

No one here can help you. Apple WILL NOT help you.

Apple does NOT get involved with secondhand purchased devices that have been activation locked from any previous owner.

FYI for the future

Never, EVER purchase Apple iOS devices from garage sales, lawn/tag sales, flea markets, antiques markets, any types of auctions, estates sales and any type of thrift stores.

Sorry, but there is nothing to be done.