Hi @Brianjde83,
A warm welcome here in the Roku Community!
We're glad to assist you with your issue with casting. Please be advised that to use casting, the supported app must be installed on both your mobile device and your Roku streaming device. You can check out this link here for more details on how to cast supported apps from your phone to a TV.
If the issue persists, please let us know.
Kind regards,
Eunice
Eunice L.
Roku Community Moderator