Same here, I got an email to my main mail account saying Google has blocked a login attempt to another old Gmail account of mine that I haven't used for a long

Same here, I got an email to my main mail account saying Google has blocked a login attempt to another old Gmail account of mine that I haven't used for a long time (the old account has the new account listed as the recovery email). So I tried to log in to that old account, and got the same message to "try again later". I tried a few more times over the next few weeks but always the same message. So even with the correct password and access to the recovery email I still can't log in to the old account, and there's no way to get around it. I just gave up.