The purpose of the Roku app on your phone is to allow you to connect to and control any actual Roku device(s) attached to the same network as the phone. The phone itself is not a Roku device and so cannot run Roku channel apps. As a courtesy, you CAN view programs on the Roku phone app from The Roku Channel only.
Roku Community Streaming Expert I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well. If this post solves your problem please help others find this answer by clicking "Accept as Solution.".
Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X