imessages are not syncing on my mac

Hi Mojie22,

To begin addressing your concern it will be necessary to understand and identify the types of messages that you're expecting to see but don't.

The support article What is the difference between iMessage and SMS/MMS? provides an in-depth guide on the differences between these message types. Essentially it boils down to how the message is transported and delivered. From that article:

"iMessages are texts, photos, or videos that you send to another iPhone, iPad, iPod touch, or Mac over Wi-Fi or cellular-data networks. These messages are always encrypted and appear in blue text bubbles...If you aren’t using iMessage, you can use SMS/MMS. These messages are texts and photos that you send to other cell phones or another iPhone, iPad, or iPod touch. SMS/MMS messages aren't encrypted and appear in green text bubbles on your device."

iMessages are sent through Apples service, while SMS/MMS are sent through your cellular carrier.

The article you posted from, Forward SMS/MMS text messages from your iPhone to your Mac or iPad, relates to forwarding those carrier-delivered messages to devices that are not connected to your cellular carrier directly (a Mac or iPad).

As iMessages are delivered through Apple, they should appear on every compatible device that is signed in with the same Apple ID. Using the steps in the article you used, you can also get non-Apple messages to show on these devices.

To isolate your concern further, it will be necessary to identify if the messages you are not seeing are iMessages or SMS/MMS. Also, if there are any similarities in the messages that are missing such as the contact they are sent to/from, age, etc will be helpful in providing suggestions or next steps.

Regards.