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.

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I met a similar problem: I used before, so I created SSO with it. But I use now. If I change it in the Firefox Account, Matrix instance of Mozilla will recognize me as a new user, so I lose my matrix account…