Hello and Welcome to the Centrify Community!
Can you tell me if you are trying to access Military email ? If so, this is not possible at this time. Please see this article, for "Problem 7: I Can't view Encrypted emails in OWA/ web.mail.mil(current or prior to receiving a new CAC)."
https://militarycac.com/EEmail.htm
I hope this helps!
Have a great day!!
Ryan V