Not sure which one did the trick but removed my Edge 530 from Garmin connect and then also removed Systm from syncing with Garmin and then set it back up again and it has got the training status working again on Garmin Connect.
AkaPete’s post re which apps count towards training status on Garmin Connect had me a bit worried that we were going to see greater isolation between the different systems (Garmin v Wahoo v …), although David.McQuillen.KOS’s recent post re outside rides now appearing on Systm calendar holds out hope this may not happen … hopefully! Fingers crossed anyway 