Games not installing on my xbox series x

Not really...

Xbox Series X games / upgrades / updates has to be installed onto the Series X internal or expansion card SSD,

You can have Xbox One games on your external hard drive that will get an Series X upgrade but the games will need to be transferred to the Series X and then the Series X upgrade will need to be downloaded onto the Series X SSD,

As an example...

I have Marvel Avengers on my external hard drive that will get the Series X upgrade and I will transfer the game over to the Series X SSD ready to download and update the game to the Series X version when available.

Since I got a series X. My borderlands 3 game would not appear in my series X ready to install section. I have it on my Xbox one but it just doesn't appear on the series X for some reason. It's all under the same account as well

Hi,

Both Series X/S games and Xbox One games that been optimised (I'm British) for Series X/S must be installed on either the internal storage or the expansion card. They can not be run from a USB connected storage device. My optimised Series X/S Xbox One games
were moved to my Expansion card during their update.

Hi,

Your drive will work the same on Series X as it does on Xbox One and you won't need to format it.

However, Series X games or Xbox One games with Series X enhancements will not run from that drive and will either need to be installed internally or to an external SSD designed for Series X/S.

Your hard drive will be too slow for Series X games. They can be stored there, but not run from there.

Hello my name is zahir a independent advisor

Owning a cross-generation bundle gives you access to both versions of the game. By default, most titles install the Xbox Series X|S version on your Xbox Series X|S console, but a few titles may install the Xbox One version by default.

Regards
Zahir