$GamerTag = "string"
$GameId = '1262182609'
$a = Invoke-RestMethod -Uri "https://games.roblox.com/v1/games/$GameId/servers/Public?sortOrder=Asc&limit=100"
$PlaceId = $a.data[-1].id
$Body = @{
	"gameId"= $GameId;
	"placeId"= $PlaceId;
	"gamerTag"=$GamerTag;
	"isPartyLeader"= false;
	"isPlayTogetherGame"= false;
	"browserTrackerId"= 9223372036854776000;
	"isTeleport"= false;
}

Invoke-RestMethod -Method Post -Uri 'https://gamejoin.roblox.com/v1/join-game-instance' -Body $Body