"Same here. Contacted support via Discord they checked my account said that account is OK and support guy from Discord said that he pass my issue to Devs. It seems that today they all on weekends/holidays.
Upd:
Tried deleting cookies, login from mobile, incognito mode, another PC, 2 browsers Chrome and Firefox - everything failed.
It look like something wrong with reCapture authorization on site - reCapture validate me as user, but site reject my login.
Also try
https://id.kinguin.net/ - in my case my account settings are opened correctly, but
https://kinguin.net/ log me off."