First, make sure that you have entered pairing mode correctly by following the steps in the pairing tutorial.
If the glasses are unresponsive and you're having trouble entering pairing mode, try the steps here.
If you are able to enter pairing mode, see a blue LED flashing, and can see Vue Audio in your phone's Settings > Bluetooth, but when you tap to connect, the connection fails, please try the following (only applies to certain Android phones):
1. Activate developer mode by following these steps
2. Go to Settings > System > Advanced > Developer Options
3. Change Bluetooth AVRCP from the default 1.4 to the new 1.6
Pairing should now work.