Most services ask for your email address and/or recovery key to recover your account. LinkedIn, on the other hand, goes full surveillance mode. It wants my actual government ID to give access to my account.
If this was critical banking service, I would have understood. But it is freakin LinkedIn, the most I have got out of that place is actual lunatics.
Honestly as someone who would wish nothing more than having to stop using linkedin...yeah they can close my account.
The only thing I use it for is arguing with tech bros and calling them morons so as to drum up my own clients. that works. beyond that it's absolutely useless. I just wouldn't bother with them, close your account, you'll be better off.