Ok, so I just ran into this on a student account. Minecraft Education decided it wanted me to sign in again. This is on a computer that uses only a single student account.
Anyway, I go ahead and sign in again and it asks for more information so we do the authentication with the code and the cell phone (this is annoying since many students don't have a cell phone handy and have to use a parents and the parent is not always available.)
Anyway, entered the code and then Minecraft shows me a screen telling me that the browser is out of date.
So, I recall some one else saying they got around this problem by opening their browser and logging into the Microsoft account and keeping it open in the browser and then trying to sign into Minecraft Education. I did that and it seems to have worked.
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