How to add non iPhone messages to apple messages
I used to get all my text messages in apple messages. Now only the iPhone users show up.
MacBook Pro 15″, macOS 12.6
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Did you one have an iPhone but no longer? To texts all users from a Mac requires you have an iPhone with text forwarding turned on and linked to your Mac.
Forward SMS/MMS text messages from your iPhone to your Mac or iPad - Apple Support
If you have an iPhone, maybe text forwarding is off or does not include your Mac. The above article shows how to connect.