Upvote:1
According to the Mastercard Guide to Benefits:
In general, coverage applies worldwide, but there are exceptions:
Coverage is not available for vehicles rented in the following countries: Ireland, Israel, or Jamaica.
You may be unable to receive benefits in Australia, Italy, or New Zealand. Please contact your vehicle rental agency before you travel.
Coverage is not available where prohibited by law.
Therefore the likely answer is that Jamaica doesn't allow Mastercard to provide their insurance services there.