Upgraded iMac to 10.14.3 this morning. Everything went well, but iMessage hasn't repopulated from my iPhone 6 (12.1.4). I can start and send new messages, but the calls on my phone have not transferred to the iMac. I tried to sign out of my iCloud account on both the iPhone and iMac and sign in again. I also started the iMac. What am I missing?