When I go through the pairing process in the Connect App I am asked to "Select an Accessory" and "BT_520" shows up. I select it, but then get a "cannot find your device" message. Everything was working fine until I upgraded last week to IOS13 on my Iphone XS. I have deleted entries, re-installed, followed everyone's suggestion with no luck.
In addition, I can only get the Connect app to recognize the device if I delete it and all data and add the device from the initial device screen If I go to "Garmin Devices" and say "add device" I receive a message saying Bluetooth is off (even though it is on).