Can't log into mojang account.

there are more issues with the switch version of minecraft, but this is one of my biggest issues. whenever i press the button to log in, it goes to a screen saying it's logging me in, then after a while of loading it stops and nothing happens. this has been hapenning for a few days. deleting the game, archiving the game, and deleting the save data hasn't worked. i don't know what to do.
if you need a video of it, here's one.