Authentication Failed for user. Attach Failed.
Since yesterday evening Uk time I have been getting the Authentication failed for use. Attach Failed, popup.
I have have already reported this and got various responses from Customer Support, the first of which was to do a clean uninstall and then reinstall of the MTGA which I did. Problem still occured. There followed several more communications the response to which seems to be just a random scripted response or an escalation up the scripted response formula.
The last of which was that there is currently no ETA on the solution to my problem and to post here.

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HPFarms#72217 commented
same problem here
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dragonwarrior#76162 commented
Game updated this morning and am able to login to play again, so obviously was not a problem my end.
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Phillybear#21030 commented
Same! Let me know if you have any luck. I can log in to a different account no problem so it has nothing to do with the device I'm using.
I've now been told by Wizards that they " don't have any known solutions to the problem you're experiencing and are unable to advise you further."
That doesn't help with all the money and time I've put in to this game