iPhone and iMessage not syncing
I have a MacBook Pro (15-inch, 2017) runnin macOS 11.3.1and an iPhone 11 running iOS 14.6. I can send and receive messages from both the iPhone and the Mac. Messages from some users appear only on the iPhone and not the Mac. Messages to those users when sent from the Mac time out after a few minutes and show as not delivered. The messages that appear on both iPhone and Mac can be sent from either iPhone and Mac. This problem has been persisting for a while.
MacBook Pro 15″, macOS 11.3