YouTube 360 ° video is not working?

I own the Huawei P20 lite and was able to watch 360 ° videos on YouTube until a few months ago. I even had the opportunity to watch every video of my choice in VR.

But for two months, both functions no longer work. When VR vote my screen turns black for a short time and then again as before, so nothing happens. And the 360 ° videos are glued to me (picture follows). I had been waiting, hoping it would be a short-term bug, but I do not know what to do next.

Can anybody help me further?

Nevermind. It works now again