Controller (iphone) can't access music services

There IS a network error because your iPhone is part of your network and it is having difficulty communicating with another part of your network. A couple of things to check initially.
1. If so-called 'wifi assist' is enabled on the iPhone, disable it
2. Is your phone connected to the 5GHz band on your router? Depending on your router and setup, this might sabotage the connection to Sonos. Make sure the iPhone connects only to 2.4GHz

John,
Thanks for the reply. I did check and the wi-fi assist was disabled. I don’t know how to know if I am connected to the 2.4 or 5 for the router band so I will have to spend some time trying to learn that today to see if that would help.

On my Android phone there is a simple setting to allow connection to 2.4 only so there is probably the same on iPhone.

If you have a Sonos device wired to your router it doesn't matter which band the phone connects to. Do you? If so, this isn't the issue. If not, wire something and see if it makes a difference

John, yes the Sonos is hard wired to the network/modem. Sounds like it must be something else?

Yes it must be something else. We should next check possibility of interference.... although it's not clear why that should affect only one controller. Your wired component should be at least a couple of feet from the router. The SonosNet channel (check in Advanced Settings) must be 1, 6 or 11. Your router should be using one of the others, e.g. Sonos on 6, router on 1 or 11, and not Auto.

The following sequence has also worked in some instances:

On the iPhone:
Uninstall Sonos app
'Forget' your wifi network
Power phone off and on
Connect to wifi
Reinstall Sonos app. Ensure you choose to connect to existing system.

John,

Thanks for the options. I checked and no apparent interference issues and the other controllers have no issues. I also had a friend with his iPhone connect to the system and no issues there either. Just is with my phone?! I tired the unistall and reinstall method with no luck.

What is also strange is that I can run pandora from my iPad and when I go to my iPhone I can’t get to my stations “music” but can play and pause that pandora station that was playing from the iPad. I am baffled.

Me too I'm afraid. Is the issue just with streaming services? What about TuneIn? Local music? 'On this iPhone', that is playing music stored on phone?

John, yes the local music on the phone plays just fine. It is only the music services, all of them, e.g. pandora, tune-in, Amazon, etc...

I am getting beyond my comfort zone here, but you might try googling 'iPhone DNS settings', and maybe see if you can spot any differences in your friend's settings for iPhone that works

Try rebooting the router (power cycle)