we have two of these with the same error, i noticed that the MS Teams for surface hub updated recently over the weekend... at first i thought it was the account password need to be reset which i did.. still nothing ... i can however use the same cred...
went to admin settings page on the hub , accounts then device account change button - i input the same password in it again... and that did it. we thought by signing the device in through the sign in prompt that was enough, but nope ... this did it ...