Sync problem, xbox issue or my ISP? UPDATE

So yesterday I reinstalled MKX only for the game to crash at the sync screen telling me “we were unable to sync your data with the cloud just now”

Every single time I try it gets to around 99% and tells me the same thing. KI seemed to work fine with the Mira update but I’ve noticed a few games won’t sync.

Contacted MS support but nothing worked, was wondering if it maybe my ISP? My xbox did say the upload rate was slow

Any and all help would really be appreciated

UPDATE

Seems to be happening on every account on the xbox not just mine. Figured out it’s not my ISP but MS support have been unable to fix the issue