My God, are you guys (Verizon Support) even reading the thread???? 

You are asking the same Questions ... over & over & over!  

It's NOT the devices we are using ... its the Verizon Message+ app, software, whatever we install on our Windows 10 computers.  Here's the problem ....

IT'S NOT SYNCING!!!!  and it's not cosistently sycing on the Messages+ through the Verizon website either.

It went from working one day (for over a years on the same cell phone and computer), to NOT Syncing at all!!   That's it.