Text Message Forwarding not appearing on iPhone 5
I'm trying to set up Text Message Forwarding between my iPhone 5 8.1.2 and iMac 10.9.5. For some reason it is not showing up in my Settings > Messages options on my iPhone.
I am signed in with my Apple ID on both devices. I can receive iMessages on my iMac but cannot receive SMS messages. In the Settings > Messages > Send & Receive options, I have both my phone number and email checked. I have searched high and low for answers but have not been able to find a solution.
Anyone have any ideas?
iPhone 5, iOS 8.1.2, iMac 10.9.5 Late 2013