- Edited
This may not be what’s causing the issue, but worth a check…
Do you have the iPhone USB tether enabled on the headunit?
DUDU Settings - Vehicle - Factory Settings (passcode 108) - USB
If that is enabled, the headunit is looking for a USB connection for the hotspot…
When I had this enabled, the WiFi hotspot wouldn’t show as connected, some apps wouldn’t load such as Apple Music, indicating no internet (but google apps and others like Spotify were connecting to the internet).
As it was a new feature added at the time, I was able to figure it out, as soon as I turned the usb tethering off, the WiFi hotspot connection, connects showing the relevant symbols etc with no issues on all apps.