Apple TV+app does not connect with smart TV

I am working with Apple MacMini M2 with the latest s/w connected to 5 GHz WiFi network which also serves my smart LG TV.

I recently subscribed to Apple TV+ app. M2 machine provides proper display and control over Apple TV+ app with display on its monitor. However, the Mac does not recognize the LG TV, i.e. Screen Mirroring does not recognize the TV. Devices shows my iPhone but it does not show the TV. The LG TV (when Apple TV+ is selected) displays screen with Apple TV+ sign centred and a sign-in-login bar below and 3 vertical movie samples. But no amount of clicking on the signin-login does anything. When going BACK, the display shows two frozen selections "EXIT" and "CANCEL". The LG was checked by an LG tech to be fine. All devices were rebooted, including the Giga Hub router and there was no change to the status quo. LG works fine with other services over the WiFi (not controlled by the Mac). The physical distance between the Mac and the TV is about 40 ft and one partition. In sum, this has been bloody frustrating. Any insight that can be offered, will be most welcome.

I guess the conclusion is that if nothing changes, I have no use for Apple TV app.