Contacts not syncing correctly no matter how I sync

I'm going to be managing about 16 inReach Units; a blend of Explorer+/Mini/66i's

Doing my best just to make all the  devices identical as far as messages and contacts are concerned.

No matter what I do, I can't get the contacts list to sync properly.  I can get a handful of the contacts, but never the whole lot.

As in:  the contacts that end up on the device only reflects a portion of what the contacts list should be.  The contact names/methods its chosen seem to be identical so there must be a logical reason...


I see on the forum that this has been brought up many times, wondering what the solution is.  It can't possibly be a matter of inputting manually - what a chore.

There has to be a better way,

Thanks for any help that comes my way.

D