I did only use one connection at a time- didn’t work with either. I missed the event I wanted to view and am now back home so this won’t be a problem until next time I’m away from home.

I also have this problem with my iPhone 15 pro and iPad Pro 11 inch despite doing all of the above on both devices.
I was trying to stream from an app using my mobile data (Optus Australia) and also the guest network of the hotel I am staying at. Didn’t work for either network. Can only Stream from the app if I turn the VPN off. Very annoying as we are on holiday.