https://www.gamespot.com/articles/pubg-xbox-ones-miramar-desert-map-test-extended-af/1100-6458547/

The first of several test sessions in PlayerUnknown's Battlegrounds on Xbox One for the Miramar desert map did not go go smoothly. There were a wide variety of technical issues that prevented the map from being played, though developer PUBG Corp. says those have now been resolved. To make up for the problems, it's now extended the test's availability.