Videos / streams do not load?

I can play neither on the phone nor on my desktop PC videos or streams from youtube or twitch.

Otherwise, the WLAN works normally.

But if I turn on mobile data on my phone then videos / streams are back to normal, so I strongly assume that this is due to the Vodafone line.

Does anyone have a solution here? I find nothing at Google.

Maybe too slow Wi-Fi? Do a speed test

The speed test has confirmed what I've already noticed and that the Internet speed is as I'm used to it and how it should be.

After a Fritz! OS update works again but YouTube streaming platforms such. Twitch still does not load the streams.

YouTube and Twitch and some other services are currently experiencing disruptions. So you just have to wait.

See also here: https://www.wz.de/digital/stoerung-bei-vodafone-google-netflix-und-weiteren-diensten_aid-47161245