Not sure if it was because I was using a few different Tasker plugins while testing but I assume the multiple resets finally fixed something so it is grabbing the UID consistently now (I believe). It is scanning with the screen off but the Spark 2 programming kicks in and opens the link rather than unlocking my phone. Not a terrible inconvenience for me personally as this chip is in my forearm and the two I plan to use are not installed yet (NExT & xDF2).
I may play around with it in the future to see if I can get it working but it would only ever be a backup in case due to the discreet location. It’s also been in for just over a week so I don’t want to mess with it too much right now.