When accessing the credentials on a mobile device, the right-justified certificate expiration text and icon is very close to the "Certificates" heading, and some of our users thought they had certificates that were expired. Just changing the text slightly could improve the mobile UX. Some examples could be:
(clock icon) indicates expiration
(clock icon) indicates certificate expired
(clock icon) = expired
(clock icon) = expired certificate
See attached screenshot for visual of current UX.