Xbox Series X/S won't open newly downloaded games

Seagate "Game Drive for Xbox" 2TB Portable HDD. It is 3.0 USB and the box states that it is designed for Xbox Series X/S and Xbox One.It works if I download a game direct to HDD but it won't open games that I have moved across - not optimised. Optimised game downloaded direct, does open and play.

I have the Xbox one X project Scorpio, I was told that the game can be downloaded in any serie X or serie S (included mine), thanks for the help!!

Game can only be downloaded on a Series S and Series X, but not an Xbox One X. Xbox One X is not the same as a Series X.

Xbox one isn't xbox one s or x compatible they are all compatible it's only the x that has some enhancements but generally the game will download on any xbox one

Series x is just xbox series s or x

Not xbox one s

If he has a Series S/X and is trying to play a Series S/X optimized game, it will only run on the internal drive or on an expansion card made for the Series S/X. It won't run on a regular external hard drive or SSD.

A normal hard drive or SSD won't work with Series S/X games. They can store them, but the games won't run from them. They will only run from the internal drive or an expansion card that is made for the Series S/X.