Make sure on your Roku that settings->system -> control other devices (CEC) -> 1-touch play is enabled.
If it is already enabled then make sure HDMI-CEC is enabled on the TV. You may want to also look for a command on the TV like refresh or reset under the HDMI-CEC settings. Of course, if the TV is very old, it may not do HDMI CEC.
Banned but back. Because why not?