Unlocking a locked 'Hide my email' account linked to the main iCloud account

I made a "hide my email" account for a service I signed up for. I didn't know what the password should have been and ended up being locked out and having to reset my password, which I did. But resetting the password only works for the main account and not the one with a "@privaterelay.appleid.com" address. My main account is fine and I have access to it, but the account linked to it still says "This Apple Account has been locked for security reasons." I still have access to an instance I'm already signed into but I cannot sign in to the new service or the same service in a new browser. So unless I unlock this I will lose access to my paid subscription. How do I unlock this?

[Re-Titled by Moderator]

Original Title: My main iCloud account is not locked, but the "hide my email" account is locked for security reasons.