An Unexpected Error Has Occured - cannot login due to faulty captcha

Hi, I have severe issues to log in to Web Connect. Everytime I get the "Unexpected Error Has Occured".

I have tried Chrome / anonym, delete cookies, disable plugins, Brave, Egde, Mozilla, Vivaldi.. then I have noticed that error occurs when I click on Captcha - and that is the same if I get to recognize Bus, traffic lights and other or just tick box.. just even without entering login detail, captcha immidietly fails and I cannot log in anymore: 

Strangely, I can log in this forum without issues, which logs me also in Connect... :/

Any idea whats wrong?

Regards

Tom