lua - How to find the gameID of a roblox place within a game

I want to teleport a player from one place in my game, the lobby place, to another place in the game, but the TeleportService uses the GameId, and I cannot find the game ID. The Roblox Wiki says yo

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Im trying to make a story game but im getting this error message: teleport to that place is restricted - Game Design Support - Developer Forum

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