If you get sysex didFailWithError: extension category returned error
error when trying to Install Dext
from Communicating between a DriverKit extension and a client app sample application, in Xcode change Bundle Identifier
for DriverKitSampleApp
and NullDriver
to shorter ones, length should not exceed 64 characters.
For example, replace com.example.apple-samplecode.dext-to-user-client
with com.example.dext-to-user-client-
to make sure whole identifier is not longer than 64 chars, as suggested on Apple Developer Forums.