In the latest blackvue App version v1.84, some of the phone's are not connecting to the direct Wifi of the dashcam.
If you are using Android version 8.1 and later, following is the procedure through which this issue can be fixed.
1. Turn on the location on your phone by going to Phone Settings > Connections > Location on
2. Turn on the location in the app by going to Phone Settings > Apps> Blackvue App > Permissions > Location on