After digging further heres what Ive found out
It passes authentication if you change the email address, which is what we use for usernames.
I tried 2 different email addresses. The one at yahoo worked, my work email did not. (see screenshot)
This also seems to be happening only on Apple devices.
Android and Windows appear to function just fine.
I have cleared the cache on clearpass thinking this would help but still have issues with work email being used as a username, personal email passes authentication