I recently picked up a Play 5 and a One, and when trying to set up the devices at home via the Sonos App on my iPhone (iPhone 8), I constantly got the error message "Network problem; Check your internet connection and make sure your speakers are plugged in" despite being on the same network at the devices and having a relatively good signal. For the sake of troubleshooting, I grabbed my iPad (iPad Pro 2017) and was surprised to see that I was not
having this issue with the Sonos app on my iPad. I was able to set up both devices normally.
The situation now is that I am able to control both my Sonos devices with the App on my iPad and
iPhone, but only the iPad app
is able to change some settings, like room settings, or add another device, like the One. If I try to do this with the iPhone app, I again get the error "Network problem; Check your internet connection and make sure your speakers are plugged in". Playback to Sonos from third-party apps like Spotify work well from both devices.
Both my iPad and iPhone are on the same network as the Sonos, run the most updated version of both the Sonos app and iOS, and are both managed devices with certificates and profiles installed by my employer. VPN is off. Both devices use the same Apple ID and correct time/date settings. I have tried to reboot the speakers, restart my iPhone and reinstall the Sonos app, just in case - unfortunately to no effect.
Any idea what could be causing only my iPhone to refuse to connect to the speakers when attempting to perform setup actions or change speaker settings?