Normally in a situation like this, I would contact customer service and get it resolved. Unfortunately there doesn't appear to be any email contact for LinkedIn customer service that I can find online anywhere. Nor does there appear to be any live chat option unless you have LinkedIn Premium membership and are signed in. But I can't sign in because I'm locked out!
The only recourse that is being offered to me is to upload a government issued ID, or else presumably I am locked out forever. This seems absurd considering I just signed up for a paid subscription. Do they want my money or not?
Is this the norm nowadays for big tech customer service? I work for a small online company and we at least offer online live chat support for anyone who needs it.
EDIT: I managed to get this resolved. For anyone else facign a similar situation in the future: I first went here to report an account access issue: https://www.linkedin.com/help/linkedin/ask/TS-RHA They then sent me an email asking again for a government ID. I responded saying that this was not acceptable because I'm a Premium subscriber. At that point, an actual person then responded and unlocked the account.