Can't fork a specific repo

Greetings,

I am trying to fork GitHub - symfony/symfony: The Symfony PHP framework but getting the error message "Being forked, check now ". If I go to the dashboard, on the left side I see symfony/symfony in my repositories which is not a fork, I should see myuser/symfony .

When I try to fork a random repository like select/select2 everything works as expected. If I check my accounts repositories tab and filter by forked repositories, I see the forked select2, but I can’t find the fork of symfony.

Am I missing something? Thank you for your help.