I guess it depends. I have not had any issues with points posting from most international locations I have visited anywhere in the world. The only exception I have had with points posting is from some of my London stays. And I haven't been to London in over a year, so I can't comment if anyone has recently had issues there or not. BTW, I've stayed at Marriotts in Australia, Asia, Europe, Africa and South America. And outside of my London trips, no posting issues.

But flyerwife's recommendation to check proper credit is always a good suggestion.