This issue is comparable to the one described in this old topic:
but the favorites are not working as expected.
So: I’ve created a few favorites coming from Open Network Stream.
But the favorites don’t work (nothing happens) when I select them, either through the 4STREAM app or the remote control.
The only way to activate them is to go through the Open Network Stream music service.
Here are a few “streams” which are played if selected here:
I struggled with this - start them playing from there, then go to device, tap it to expand it then press the three dot menu. Menu option preset, takes you to the list of favourites/presets then select the preset number you want.
I wont be using the app much, I stream mostly from Home Assistant or listen to spotify. I just wanted to get 6 presets on the remote control for ease of use. That worked for me - the first 6 presets are now accessible from the remote.