I've recently setup a third party router from ASUS, the ZenWiFi AX 6600 as a direct replacement for the BT Smart Hub2. I have FTTP.
All works well connection wise, however I'm unable to use any of the apps etc on BT TV. I'm given the error YVM104.
I've had a similar setup before with a different router, however I ran everything through the BT Smart Hub in bridge mode (TV came directly out of the Smart Hub, then through BT powerline adaptors).
Is there any way of getting full functionality of the TV and VoIP phone without having the Smart Hub connected directly from the Openreach Modem?
Do the BT TV subscription channels play ok? The streaming uses IGMP Multicast which needs enabling in your router and not all routers support this and not all implementations of it work with BT TV. Don't know if that's your issue if it is only with the apps that you are getting an issue.