Cant connect to 360 live from my series x to play backwards compatibility games

The game is not backward compatible, so would not work on the Series X console. Your only option would be to play it on the Xbox 360. The list of backward compatible games can be found here. https://www.xbox.com/en-GB/games/backward-compatibility

Yes, Modern Warfare 2, and it's DLC for the Xbox 360 can be played on the Series X and Series S consoles. You can check the list of backward compatible games on here https://www.xbox.com/en-GB/games/backward-compatibility

Hi,

Unfortunately LoTR War in the North (Xbox 360) is not backwards compatible with the Xbox Series X. Only a select number of Xbox 360 titles can be played on Xbox One and Series X consoles.

You can look and search the entire list of BC games here: https://www.xbox.com/en-US/games/backward-compatibility

For the moment, just some games from Xbox and Xbox 360 are backwards compatible. We have confirmation those same titles and also all Xbox One games will be backwards compatible on Xbox Series X.

That game is backwards compatible so you can play it on the Series X with the 360 disc, but online servers were shut down for the 360 version of the game.