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I saw a thread from four months ago, but it was locked without any clue as to resolution. Tech Support was unable to help as well.
It's on a new Mac by the way.
There isn't much resolve on this, is there? I've searched and there are a few reports but no fixes. I wonder if it just magically fixes itself via certificate updates?
I read elsewhere that Cox was working to fix this. Maybe it's a Microsoft issue that'll get repaired with an update.
I'm having the same issue but I can't revert back to Legacy. It just crashes & can't open. I've been online with Microsoft, Apple (instore too) & Cox.