Unable to "Complete Registration on KDE Identity"

[GMX Lukrez]

Dear members of the KDE Webteam,

I tried to migrate my old forum account (lukrez at gmx.at) to 
identity.kde.org.  I filled out the form for registration, received 
the email and tried to complete the registration.  Turns out that 
I need an username, but couldn't select one from the drop down 
box (see the screenshot).

What else can I do?

Best regards
Franz Häuslschmid 
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