How to change email on Mozilla's SSO?

I logged into Mozilla’s SSO to create a Riot/Matrix account.
However, I mistyped the email address I wanted to use, and I would like to use another email address ti get to that account.
How could I do that ?

I only created, with the same SSO account:

  • A Riot/Matrix account
  • A Discourse account (to be able to post here)

Creating another account would make it impossible to re-use the same nickname, and is hence not a possibility.