All I know if that quite often Germany users are known to report issues with accessing Twitch. This pops up on the dev Discord, reddit and other places periodically.
It happens quite often (granted I’ve not heard a report recently) and usualy the issue is internal to Deutsche Telekom. Not much Amazon/Twitch can do about that other than complain to them. (again this is based on reports from users on Reddit whom when comparing providers report they are using DT)
“You”? Please note I am not Twitch staff, just another third party developer.
Then the issue is with Fastly, and you probably want to take it up with them as it’s probably affecting other services, not just routing to Twitch.