I've been having this problem for Months and have done a few different bug reports but nothing seems to be fixing the problem. 

Minecraft keeps logging me out of my Microsoft account and it takes MANY log ins to my Microsoft account on my switch to be able to play with friends or wear my skins. Some of those log ins will sign me out straight away sometimes it says it's logging me in and it's not and I have that on my screen for over an hour. It also keeps coming up with error messages and I know for a fact that there's nothing wrong with my Microsoft account because that's what I use for my email and one drive and it has no issue logging in to either of these. I also personally spoke to Microsoft and they believe it's genuinely a problem with the game rather than my Microsoft account