Zwift Companion for Android - No "Game Mode" Screen

[Mike_Rowe1 (Mike)]

You may want to try @Paul_Allen’s suggestion in this other thread:

Zwift on PC with Ethernet and ZC on Phone on Wifi

I also have the same setup and it works without problems. Is it possible that you are connecting to a “guest” network on your router? These are normally configured to isolate traffic from the rest of the network.