Lost access. Duplicate ID

I couldn’t access my Mozilla account [lost codes] so I created another one. Now when I upload extension it doesn’t let me because “Duplicate ID”.

It would be great to be able to recover my 1st account, but according to this info I can’t do it
https://support.mozilla.org/en-US/kb/what-if-im-locked-out-two-step-authentication

How do I get out of this mess?