Mmsumulong,
it worked and thank you so much!
If anyone is still having difficulties adding Epson on/off functionality to their remotes, try these steps in ROKU:
Settings, Remotes & devices, Remotes, [Your remote’s name goes here], Set up remote for TV control, CEC setup, “HISENSE”, Yes, music is playing, No.
Just a note that when Roku does an update it may no longer function. There was an update once and the remote did not work with my LS500. But after six months and another update it worked again. Just take note.