Mac not syncing message history.
On my mac, I haven't opened the messages app in a few weeks. Earlier this week, I opened it and it contains messages up until the last time that I used the messages app (a few weeks ago), and it contains all messages from the day that I opened the messages app (earlier this week) until now.
It is missing all of the messages for the few weeks that I didn't use the app on my mac. I can't get the app to sync those weeks of messages.
I've tried everything I could find online. I've signed out of my apple account on my phone and on my mac and then re-signed in. I've checked to ensure text forwarding was setup. I've restarted my mac. I've confirmed that my phone and mac are using the same account. None of that made a difference.
It's properly syncing any new messages, but I need it to sync old messages.
I should mention that I had some success for a little bit by quitting the messages app and then re-opening it over and over. Each time it would sync just a few more messages. I did this about 100 times and was able to get it to sync like 2 days worth of messages. After a while, this method stopped working though.
MacBook Pro with Touch Bar