hmmmm ok i've been trying to install a game from my subscription on my Xbox Series X for two days.. xD every time it gets partway and then shows this:

Something went wrong
We couldn't install this game.
Check your storage and network, then try again.
0x87e00017
0x87e00017... im installing to an external SSD... other games launch fine, its only the install that fails. i restarted teh console and checekd my internet, both look okay. im out of ideas, and the weekend i planned for this game is disappearing... what do people uusally do about this one?
im fairly patient, but this is the third evening in a row Ive spent looking at progress bars instead of playing. any ideas are welcome.