I have been signed up with an SSO Google Account . after that I wanted to choose a good username for myself but for that , X wants me to use my password . but which password ? I have login with SSO  an now what I have to do ?

I have fill the form in support page
after that he send me an email
to signup with my user and password .
I don’t set passwords yet ( I have signed up with google SSO )

where can I tell to x.com ?
they don’t know about this failure flow