GetPlayerPlaceInstanceAsync returns HTTP 403?

Every time I use this method with a valid userId it always returns the following:

false, "HTTP 403 (Forbidden)", (some random PlaceId)

Does anyone know the reason why this is happening to me? Is it me or is it something else because I feel like its Roblox. I even tried the method in a script all by itself with a valid userId and it returned the same thing.

Here's the snippet where the method is used (this is inside a LocalScript)

local function attemptJoin()
    local success,errormsg,placeId,instanceId = transport:GetPlayerPlaceInstanceAsync(tonumber(userid))
    if not success or placeId == placeIds.hub then
        global.signal.warning:fire("Player not in Building Universe"..(success and "" or ": "..errormsg)) 
        join.Text = "Join"
        canRespond = true 
        return
    end
    if placeId ~= (stype and placeIds[stype] or placeIds.public) then
        global.signal.warning:fire("The player was not detected in the requested server type.") 
        join.Text = "Join"
        canRespond = true 
        return
    end
    join.Text = "Working..."
    transport:TeleportToPlaceInstance(stype and placeIds[stype] or placeIds.public,instanceId)
end