Your speaker might be out of range from your router.
Try this:
– First, place the speaker as close as possible to your router.
– Then turn the speaker off, pull out the power cable, and wait for 30 seconds.
– Reconnect the speaker to power, and wait until it connects to your network again. Go to the app and see if the speaker appears in My Speakers. If not, force-close the app and reopen it. Your router might need to be restarted.
– Please see your router's manual for instructions.
After you have restarted your router, please go to the Audio Pro app and see if the speaker appears in the My Speakers view. If not, close the app and restart.