installed games to external ssd. games wont do updates

If anyone is interested, we managed to find that the problem only occurs if the game is installed on an external ssd.

If the game is moved from the ssd to the internal hdd the problem does not occur. Formating the ssd and moving the game back did not fix the problem. Other games launch fine from the external ssd.

The problem seems to be linked to (external?) ssds and (Rise of the Tomb Raider?) DLCs.

Yes i have a C Drive SSD and a D Drive and wont install on either. Edit: I Just plugged in an Xbox external drive and tried to install on that but no joy again

This has been covered and been mentioned as it has been a big concern. Right now, yes you can use your external SSD to play Xbox One and Xbox 360 games but you will not be able to play stored SX games on the external SSD. To be able to able to play SX
games they need to installed on the Series X's SSD not the external one.

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.

Interesting. I have the game and all it's DLC installed on an external hard drive with no issues. The only difference I can see is that you're using an SSD hard drive where I use a plain old WD Elements.

I'm wondering if it's something to do with the nature of how SSD drives store data compared to none SSD drives.

Do you have the external drive set as the default location for all downloads/installs in the storage settings on the Xbox ?