Strava Beacon + Garmin LiveTrack not working.

Beacon and Live Track are both sending notifications when I start a ride, but both say "activity not started" for the duration of the ride, ie/ they are not providing any tracking info.

I am using a Garmin Edge 520 and an Android phone, both have worked perfectly for the last couple of years.

I have tried:-

1) uninstalling/reinstalling both apps.

2) turning bluetooth on and off

3) deleting and re-pairing the Garmin with the phone

4) starting LiveTrack manually and using autostart

I'm running out of ideas anyone had similar issues and found a successful solution ?