iOS Remote App - All inputs turn off Vizio TV

I have a Vizio TV that I have added to my Home on Homekit. There is a Vizio official remote app on iOS, but when I tried to use the Apple Remote app instead, all inputs (up,down,left,right,pause,volume, etc.) instantly power down the TV. How can I fix this?

Note: I do not own an Apple TV, but I can control the Vizio TV with some limited commands (power, input) in the Home app.