This took me a while to figure out. So, I’m putting it up where it can be found via internet search.
Link to FB post re: these shareerrors: Looped | Facebook
Link to Zulip discussion: Log in | Zulip
Photo of Zulip discussion (if you aren’t on Zuplip):
Date of this post: Aug 8, 2019
Solution: Rebuild Loop if you haven’t done so in the last 2 weeks.
Summary: BT is working fine. Transmitter Id fine. Firmware on my new transmitter (id 81XXXX) is funky. Need to rebuild with the newest version of Loop. This threw me for about a month since I first installed Loop. It is fixed now.