Save on Xbox is not synchronizing on PC

I have level 31 on Xbox. I am an Xbox gamepass Ultimate user. I am level 30 with millions in my account on Series. X. When I load the PC version. I am only level 30 with less than a million. This is the first game that has been PC anywhere that doesn’t synch properly. Marvel Avenger is the last game I tried on Series X and PC and save data was sync. I am on Windows 11. Could this be the reason why ?