Receive SMS with iMessage on multiple Macs I have 2 Macbooks, one old, one new. Both are configured to be able to receive the SMS of my iPhone and cell number through iMessage.

However, only the old Macbook is receiving SMS, while both old and new Macbook receive regular iMessages configured with my Apple iCloud ID.

When I got the new Macbook, I stopped using the old one, and could receive SMS with the new one freshly configured. At one point, when I used the old Macbook again after some time, the new Macbook stopped receiving SMS altogether.

Is there maybe a limit to how many Macs can receive the same SMS through one iPhone?
Have you checked the settings on both devices? Message settings on iOS and the settings window (CMD + ,) in messages on your new Mac?

Text message forwarding happens on the following iOS settings page for iMessage: