Not Sure What This Teleportation Error Is?

After running this block of code:

local PLAYERS = {}
if PLR1VALUE.Value ~= nil and PLR2VALUE.Value ~= nil then
    table.insert(PLAYERS, PLR1VALUE.Value)
    table.insert(PLAYERS, PLR2VALUE.Value)
end
if PLR1VALUE.Value ~= nil and PLR2VALUE.Value ~= nil then
    local TS = game:GetService("TeleportService")
    local code = TS:ReserveServer(1431950426)
    print("Success")
    TS:TeleportToPrivateServer(game.PlaceId,code,PLAYERS)
end

I get: Teleport exception: HTTP 400 (HTTP/1.1 400 Bad Request)

PLR1VALUE and PLR2VALUE are objectValues with the player inside of them, this error breaks my game and so far after searching google I still can't find an answer- the places are in the same game and they're both active, HTTP services are enabled- not sure what's causing this error.

note: "Success" does not print.