Why won't my app install on my Vivoactive HR?

My app, raceQs, won't install to my VA-HR from Garmin Express on my Mac or Connect IQ on my iPhone.

On each device I'm told it will install on next Sync... but it doesn't! And I've been around the cycle half a dozen times since yesterday.

Particularly frustrating as I'm trying to debug an issue being reported by a user on a VA-HR which I can't repro on the Sim, and now I can't install the store version on my watch.

Any suggestions?

I was going to post this on the device forum, but I can't find one for the VA-HR... has it been quietly abandoned?