Danny,
Here are my troubleshooting issues.
1. I power on the ROKU TV (Phillips 32").
2. I power on the app on my iPhone (SE build 14.2)
a. I cannot find the device.
2a. The device (ROKU TV) and phone are both on the same network.
2b. The device (ROKU TV) and phone and wireless router are 10 feet apart with no barriers whatsover.
3. I cannot active private listening.
3a. It did work 1 time for the duration of my watching TV but never again. Cuts out like a bad AM radio station.
4. I added the ipad remote for ROKU. the same as the iphone. Worked once then went bad. Cutting out.
On my Spectrum wireless router/cable modem I cannot change the channel per other instructions.
Finally, I am partially deaf so listening on my bluetooth headphones (no jack needed - update your troubleshooting steps as I saw that in there) is desirable. Plus the sound is way better especially for movies.
I have done the reset modem thing. It worked ONCE. (It's a Technicolor Modem/Wireless Router
This seems to be a pattern. Work once then obliterate your private listening experience.
I am a technical person as I was on wireless in 2002. Yes, 2002 my home I owned had it. I know my way around a router.
Kindly let me know if there are other steps to do that will work more than once. I have given you enough test data (I was a computer programmer for 25 years) in which to troubleshoot the problem in your lab.
Also, this ROKU TV does not have a headphone jack (2.5 mm or 3.5) else I'd use my bluetooth adapter to get the sound I so richly deserve.
Thank you.