MatchMaker - error: maximum capacity reached

(Solved)
我用這個例子

得到這個錯誤

MatchAssignmentError : Ticket: b7a29120-3186-470e-b734-b31ab8554073 - Failed - MultiplayAllocationError: request error: maximum capacity reached (2) (request-id: e33dd3ff-c99d-42d6-9c61-9a9a2efb39bf)

請問可能的原因?

(Solved)
Click build linux server at the top of the project and upload it to ugs.
Originally, the output would be clinet according to the general process.