How to Enable Text Message Forwarding
When setting up the Call and Text Sync App, if you do not see the Text Message Forwarding option, check the following:
2.) Make sure you can see your messages on all your devices
Note: Make sure you're signed in to the same Apple Account on each device.
Enable Messages in iCloud
1.) On your iPhone, go to Settings.

2.) Tap on your name at the top.

3.) Tap on iCloud and then Saved to iCloud - See All.

4.) Tap on Messages in iCloud and confirm Use on this iPhone is enabled.

Make sure you can see your messages on all your devices
1.) In your iPhone Settings, search for "Messages" in the search bar at the bottom. (Or, in Settings, tap Apps, then Messages.)
2.) Tap on Messages when it appears.

3.) Under Messages, tap on Send & Receive. Make sure that your Apple Account is selected under You Can Receive iMessages to and Reply From.
