Signature Certificates are disappearing from the Adobe Identities page

After updating to version 15.006.30279 our signature certificates are disappearing for the Adobe Identities page. This is prompting all of our users to create a new signature from file every time.  Some of our users have a usb token that has a certificate on it. This brings up the Sign Document tab where they can use the “Sign As" drop down and “Refresh ID” to get it to appear. But once they remove their token with the other certificate on it or restart Adobe, the problem continues.

Does anyone have any solutions?