Xbox Series X Not Playing Games?

Because on my Xbox series x, it only shows 'Optimized for series x/s' but if a xbox series x version of a game is NOT 'optimized' how would i know if I'm playing a series x/s version of a game?

Xbox One games can be played on the Series S/X, but Series S/X games cannot be played on the One.

The games on the SSD will run fine on it. You won't need to move them to the Xbox Series X storage to play them. Only the Xbox Series X games & games optimized for Series X will need to be played on the consoles own storage.

I just bought a brand new Xbox One X, but when I go to the store, Flight Simulator and other Xbox Series X/S games say they are "not playable on this device" and I can't get Flight Simulator to install on my brand new Xbox One X because it says it's "not compatible". Very frustrating.

So you bought an Xbox One X and expected to be able to play an Xbox Series X game on it?

Why would a game made for an Xbox Series X work on an Xbox One X?

If you want to play Xbox Series X/S games I would take your brand new Xbox One X back to the store you bought it and see if they will take it back and you could try and buy an Xbox Series S (Series X consoles are very hard to find, but a Series S can be found fairly easilly)

nope, most if not all current games on xbox one will be playable on the series x, eventually there will be games release just for the series x and they wont be playable on previouse console versions.

Xbox one s and Xbox one X are the same family, series x will be the new console and eventually (a couple of years down the line hopefully) games will only be release on the series x family so the xbox one x will not be able to play them.

If this is not confusing