How to create a new Matrix account (ID) on chat.mozilla.org when logging in with a Firefox account (SSO)?

Hello,

some time ago I logged into chat.mozilla.org via my Firefox account (SSO) and created a Matrix account. Due to a typo in the ID I closed that Matrix account and hoped for a second chance. However, when I try to start from the beginning I am just notified that my account has been deactivated (obviously), not how to get a new one:

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How do I create a new Matrix account when logging in with a Firefox account (SSO)?

Thank you!