
or it could be subscription@geni.com
try them both, i don't remember which it is.
Your situation is not unusual so they have a process.
If you know your old email that you used on that account, and the password you used, see if you can log in using them.
That used to be possible. After which one could change the email be first adding an email.
If you cannot do that -
See if https://www.geni.com/discussions/278303?msg=1697101 is relevant.