For a few days now I have had the problem that YouTube videos are only displayed in 480p. Have a Huawei Mate 20 Pro that has a 4k display and shouldn't be a problem. If I go on the gear, it says "480p (Automatic)" but has very good Wi-Fi and otherwise I would not think of anything. Otherwise I could always enjoy videos at the highest quality.
Set the quality yourself to 1080p or 4K.
I've already tried it. However, it does not respond.