BT sport 3 casts to the TV ok but when I try BT Sport 2 after a minute I get a grey screen with a BT logo and some tedious music.
I've rebooted my phone, cleared BT App cache and rebooted chromecast but still the same.
I can watch BT sport 2 on my phone.
If you're still experiencing the same issue today, please uninstall the app and reinstall it.
Let me know how you get on with this as I have been trying to replicate the issue but can't today.