You use that account for adsense revenue, but you did not add a secondary recovery email, nor a recovery phone number ? When you do not have any other recovery, google tries a recovery method based on questions ("when did you register the account", "what's an email address you often contact", ...) where the answer do not need to be strictly exact, have you tried that ? And you failed it ? If yes to both of those, how…
I have a recovery phone number in there. I'm verifying it everytime Google asks me to, but then it takes me to verify the code from the same email that I don't have access to.
It makes no sense but that's what's happening.
Here's the flow of how it's going.
Forgot Password → Enter the phone number ending with XX → Enter the code sent to your phone → Enter the code sent to your email (the same email).
I've tried the recovery methods, there's no other way that Google is offering me to recover the account. I'll happily answer all the security questions if Google asks me to.