My inReach was setup in accordance with all instructions, synced and updated after several hours of slugging it out with Garmin Express. Since Garmin doesn't answer phones on weekends (probably smart, since people only recreate M-F during office hours) I'm stranded by Garmin, again.
Test message protocol worked fine. Messages go out fine. Messages from my phone seem to go through without a ton of problems. My wife has sent 7-10 messages, in varying lengths, via various methods (SMS, replying to received messages, SMS to the displayed phone number from my inReach, and to the "email address" format.) So far, over the span of 25-30 hours, none have been received.
Also, it will not receive messages from other inReach devices.
I should have stuck with SPOT, I suppose. I still have a first gen device, it's been beaten on, dropped, frozen, gotten wet, and operated in a salt air environment for 7 years and works 100% of the time.