When only some messages sync between your iPhone and Mac, it usually means SMS/MMS (green bubbles) forwarding is disabled or your iCloud sync addresses don't match.
Here is how to fix it:
1. Enable Text Message Forwarding (for SMS/green bubbles)
- On your iPhone, go to Settings > Messages > Text Message Forwarding (on newer iOS versions: Settings > Apps > Messages > Text Message Forwarding).
- Toggle ON your MacBook Air.
2. Match "Send & Receive" addresses
- iPhone: Go to Settings > Messages > Send & Receive.
- Mac: Open the Messages app, click Messages > Settings in the top menu bar, and click iMessage.
- Make sure both your phone number and Apple Account email address are checked on both devices under "You can receive iMessages to and reply from."
3. Force a manual sync
- On your Mac, in Messages > Settings > iMessage, click Sync Now.
- On your iPhone, go to Settings > [Your Name] > iCloud > Saved to iCloud > Messages and tap Sync Now.
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