APPLE CREATED TWO BUGS IN THEIR BLUETOOTH SOFTWARE in October 2019
(APPLE ISSUE 1) Apple has changed how your bluetooth radio SETTINGS work. If you are getting a message like "turn on bluetooth" and you feel that it is already ON, then it is because you have inadvertently DENIED access to Avi-on. You have two choices: fix the item on your BLUETOOTH SETTINGS screen, or contact APPLE for assistance. To fix it yourself, please go into the SETTINGS folder for your PHONE, scroll down to the Avi-on app, and then ALLOW bluetooth for Avi-on.
(APPLE BUG 2) Apple's latest iOS has a conflict between your iPhone 11 and your iWatch. If you are having trouble using the Avi-on app, power off your iWatch or turn off the bluetooth on the iWatch. Avi-on is building a work-around for Apple's bug...or Apple might fix it soon, because Apple's Airpods are having the same problem.