How did you solve the problem?
I largely gave up after 3 months of trying, and created new accounts for everything.
Years of work lost largely due to being stonewalled by Google support at every step.
My current best hope for recovery is that the recent lastpass breach data goes public and I can crack my own vault using the passphrase I know for it.
Maybe double check the "try another way" login options and maybe one of them will help you get back in.
Good luck!