I have exhausted every avenue trying to find a problem reading encrypted USAF webmail. I am using IE 11 on Windows 10. I thought I had this feature working a few days ago, but in my tinkering to get other websites working I appear to have broken the S/MIME functionality.
I can access the OWA site and unecrypted email fine. I am using Office 365 OWA webmail at https://cp.mail.us.af.mil. I found that this was the only link that works for me. I have downloaded all of the DOD certificates and installed ActivClient 7.1.0.213.
When I click on the S/MIME link in the conversation view of an encrypted email, a pop-up is generated with the email. That pop-up window will not display the message content and instead gives me the following error:
"The S/MIME message wasn't decrypted successfully. No certificate was found. If you have a smart card-based certificate, insert the card and try again."
I have tried clearing the SSL, removing all user certificates, added af.mil to compatibility view and the website to my trusted sites. I even did extensive work ensuring my CAC card has the correct email and PIV assigned from the DOD ID Card website.
This seems to be an issue with the pop-up functionality of IE 11 and S/MIME. I have tried reinstalling several times.
I appreciate any help, thank you!