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Alex,
you mention that you have escalated this internally, but you are also asking me to open a support ticket.
Which 1? Has this been escalated internally?
I am not opening a support ticket. again I DO NOT NEED ANY SUPPORT.
This is a product issue that Microsoft needs to resolve, this is not my problem.
Further to this point, I have reported several bugs to microsoft (premier) support where the resolution is "please raise a uservoice ticket as we do not have the correct channels to escalate to the product team".
I will not be wasting my own time on this.
One you have raised a uservoice ticket or bug report, paste the link here so we can follow it please.
(PS, funny you mention an "infected user"!! this is a product bug, not user related, and it is certainly not an infection!)