[Could not start output. Check the Root Certificate and Date/Time Setup on your camera.] is displayed on the smartphone.

Display of [Could not start output. Check the Root Certificate and Date/Time Setup on your camera.] in Creators' App indicates that streaming output has not started.
First, make sure the date and time settings on the camera are correct. If the camera date and time settings are correct, update the root certificate on the camera. For details on root certificates, refer to the camera help guide.