Plex for Xbox One is not listed as a cast option on iOS devices.

I have three iOS devices connected on the same network as my Xbox One and I’m unable to cast videos from the iOS devices into the Xbox One.

I’m able to see Roku on the iOS devices.
I’m able to cast from Netflix app on iOS device into my Xbox One.

The issue appears to be specifically casting video from iOS device into Xbox One.

https://support.plex.tv/hc/en-us/articles/201812818-Cast-from-iOS

The main reason that I want to use the mobile device to cast into the Xbox One is because the Xbox One app does not have an “Unwatched” category for movies or TV shows.

Has anyone else seen this issue?

The Xbox One app does not yet support this feature. See this thread for other items not yet implemented: https://support.plex.tv/hc/en-us/articles/204103423-Where-is-feature-X-