YouTube does not load videos in my Wi-Fi but with mobile data?

So if I, when logged in to my internet, click on a video, then the video does not load. Otherwise, YouTube and everything else on my phone, e.g. Netflix. If I have enabled mobile data, YouTube works flawlessly. I've already downed and reinstalled YouTube, restarted my phone twice, and even logged into YouTube on the web to try it out. Did not work either. Have tried it on other devices, there's not synonymous.

There are currently issues with YouTube and some other services. So just wait and see if the problem will solve itself.

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