Can't register on Twitch?

I can't register with Twitch for an unknown reason. I provide all the information, but if I then want to complete the process, there's a minus in my email. At first I thought I had already registered, but when I wanted to register, it was said that this email was not taken. I also tried other emails, the same everywhere. I can't do it with Ikognito either, and I've already deleted browser data.

There were a few problems right now, so maybe

https://allest%C3%B6rungen.de/stoerung/twitch/