How to make fireserver game to others game in roblox studio

i want to make find game in roblox studio and there is a teleporter to another game i create and it have something to collect i want it to fireserver to my main game to get badge

It is not possible to fire servers across servers.

Can’t you award the badge in the game that you teleported from right after teleporting?

You could use the GetService function to get the TeleportService and use it to teleport the player to another place.
If you’re trying to teleport to another game, you can use TeleportService with the TeleportToPlaceInstance function.
If you’re trying to teleport to another part of the same game, you can use TeleportService with the TeleportToPlaceSpawn function.