You would have been asked, when first trying to use Bluetooth with SkyDemon, whether to give SkyDemon permission to use Bluetooth. It appears you said no (or somebody did) so now SkyDemon does not have permission. You can fix this in the Settings app, probably under Privacy or Bluetooth, where you control which apps are allowed to use Bluetooth.

Thanks Tim - sure enough going into iPad - Settings - Privacy & Security - Bluetooth - in there, Sky Demon was showing with toggle off for Blue Tooth permission. I have toggled this to green to now give permission. Looking forward to seeing it now work when I next go to airfield 👍🏼

For everyone waiting for a solution for Becker AR620X: Yes, there is progress. The translator solution already works, but there will also be a solution from Tim without a translator. Stay tuned.