My iPhone won’t connect to my Roku TV

I bought a Roku TV to screen share my peloton app from my phone to the tv. It was giving me problems connecting, sometimes it would sometimes it wouldn’t. I spoke with Roku, they had no solution. I chatted with Apple and they gave me a phone number to call. I called and they said to update my phone and it should work. Updated it and now it won’t even connect sometimes. I’ve spoken to a few apple representatives and they keep telling me to restart the devices.

Any suggestions? My phone is updated, on the same network. My VPN is disabled.