How to teleport all players in seats to reserved server?

The Occupant property of VehicleSeat correlates to the Humanoid, not the Player. Since TeleportService’s method TeleportToPrivateServer requires an array of Players, we have to reformat the table to contain the affiliated Players to the Occupant Humanoids.

This doesn’t take us off rails too far, as we can take the knowledge of the Humanoid being a child of Character, and go from there using Players’ GetPlayerFromCharacter method.

Create a function that will iterate through our Vehicle, and return us a table of all Seated Players with the information we just learned:

local TeleportService = game:GetService("TeleportService")
local Reserve = TeleportService:ReserveServer(game.PlaceId)

local Players = game:GetService("Players")

local Car = workspace.Car1

local function SeatedPlayersThreshold(Vehicle, PotentialMinimum)
    local AllSeats = {} do
        for Seat,_ in pairs(Vehicle:GetDescendants()) do
            if (Vehicle[Seat]:IsA("VehicleSeat")) then
                AllSeats[Seat] = Seat
            end
        end
    end
    if not (#AllSeats >= (PotentialMinimum and PotentialMinimum or 1) then return end
    return PotentialMinimum or #AllSeats
end

local function GetSeatedPlayersFrom(Vehicle)
    if not (Vehicle) then return end
    local SeatedPlayers = {}
    for _,Seat in pairs(Vehicle:GetDescendants()) do
        if (Seat:IsA("VehicleSeat")) then
            local PlayerInSeat = Players:GetPlayerFromCharacter(Seat.Occupant.Parent)
            if (Players[PlayerInSeat]) then
                table.insert(SeatedPlayers, PlayerInSeat)
            end
        end
    end
    if (#SeatedPlayers < SeatedPlayersThreshold(Vehicle)) then return end
    return SeatedPlayers
end

TeleportService:TeleportToPrivateServer(game.PlaceId, Reserve, GetSeatedPlayersFrom(Car))

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If you want to teleport all players sitting in a car, you should iterate over all the car seats and add the players to an array. Right now you’re only adding the player that’s sitting in car1’s seat. For this you can use a for loop:

local players = {}

for i,v in ipairs(game.Workspace:GetDescendants()) do
    If v:IsA("VehicleSeat") then
        players[#players + 1] = v.Occupant
    end
end