IHost cast off TRV not okay in safari

Is the iHost cast of TRV working for anyone else who uses a iPhone Safari?
Oddly mine doesn’t work in Safari but does in Firefox on exactly the same phone, which is odd as I thought they both used an Apple web engine.
I think I missed out on the latest OS update because of my phone’s age but it has the latest of that version.

This magically solved itself. Didn’t restart the phone or anything. It just started working.