For a third party energy app to be able to control the car, there is a need for a working control connection from the EV manufacturers servers to the car and from the third party to the manufacturers servers. A data connection is also required to form a link from the servers to the car.
Unfortunately, if an EV manufacturer’s server is being overwhelmed due to volume of requests, the EV manufacturers system has reached its limit capacity, either temporarily or the manufacturer chooses to break the link with third party companies.