"TeleportService:ReserveServer can only be called by the server." In PlaySolo

local Id = game:GetService("TeleportService"):ReserveServer(1818)

This code should return a reserved server id, or possibly output an error being in Play Solo. This code will output “TeleportService:ReserveServer can only be called by the server” instead. Doing this in a local server will either work or give an HTTP error 403 (which is proper behavior)

This is happening with a baseplate on production. I am using Windows 10 Pro on a Sager NP8153 / Clevo P650RS chassis (GTX 1070, i7 6820HK @ 3.8 GHz).