The company had enabled the feature for all Model S owners without first retrieving approval by the city’s Transport Department. The Wall Street Journal reports that the agency is now saying the new software might not meet regulations and has requested that Tesla stop releasing it to more vehicles and disable the function on ones that already have it.

Tesla (TSLA) CEO Elon Musk has previously referred to the electric car’s autopilot as a “public beta.” The company continues to refine the function as drivers use it. Hong Kong’s Transport Department has issued a warning to Tesla Model S owners stating the following:

Although vehicles may be equipped with advanced driver assistance systems, the roads in Hong Kong are extremely busy, and motorists should stay alert [and] maintain control of the vehicle.

The South China Morning Post writes that the agency has approved Tesla’s autoparking function, but not automatic steering or lane-changing. Tesla is currently working with the department to get the necessary approval.