Mine hasn't been syncying either (on laptop or ipad). I made the HUGE mistake of disconnecting both devices from my phone (thinking that I would reinstall the app). Now I can't install the app on laptop or ipad. I get an error msg on ipad stating "Not able to generate pin". On laptop, I receive a similar type of error msg. When I try clicking on Subscribe - Integrated Messaging Features (on my phone), it quickly flashes a message "Please Wait - Messaging....."(I can't see the rest of the message because it immediately goes away. Any advice would be appreciated.
I am running iMac, ipad air2, samsung galaxy edge 7. the messages+ app frequently doesn't sync between devices. this has been going on for months and getting old!