No DVR Functions on Xfinity Stream App

My household switched to a Roku TV and the Xfinity Stream app a little over a month ago, and for the first two weeks or so, everything was functioning properly. Then, seemingly overnight, all DVR/Recording functions disappeared from the app. Live TV still functions properly, but all recording functions that were previously accessible from the menu are no longer there. We haven't gotten any error messages or anything else diagnosable to work with. I have also tried accessing Xfinity Stream from other devices, such as PC and mobile, only to encounter the same issue.

The problem does not appear to be with the TV or the app, so I can only assume it must be something to do with our account, but I don't know what that could be. Any insight would be greatly appreciated.