Messages on iPhone not appearing on Mac
After following various threads with similar issues, I have logged out of messages, rebooted both Mac and iPhone, verified iCloud - iTunes user is the same across devices.
After logging out of AppleID in messages and turning off iMessages, on reboot I get the message "messages in icloud not available as icloud and imessage accounts do not match"
iPhone XS.
Deleting a lot of messages from my iPhone does not alter the message storage space in iCloud.
Same problem occurring with my wife's MacBook Air and iPhone 7.
Help please.
MacBook Pro with Retina display, macOS High Sierra (10.13.6)