SMS relay only works with one iMac or Macbook Pro, but not both?

I recently got a new iMac (5K). I already own a Macbook Pro 13" (bought in 2013). When I got the new iMac, I wanted to transfer all my data from my Macbook onto the new iMac, so I used the most recent time machine back-up from my Macbook to install onto the new iMac. No issues there. I also own an iphone 5s and ipad mini (1st generation), all with the most recent software updates. Approximately 1 week ago, SMS relay stopped working between my iMac and my iphone. I could type an SMS text message on my iMac, send it, and although it would transmit to the recipient, it would say "not delivered" on my iMac (it would show up as delivered successfully on my iphone). Consequently any SMS messages received would not show up on my iMac. I use the same login for my macbook pro and my iMac and for some reason my iphone stopped listing my iMac as one of the devices for SMS relay. I was on-line with Apple support for 3+ hours yesterday trying to figure out why this wasn't working. I did an SMC reset which temporarily fixed the problem, but as soon as I tried to use SMS relay with both the macbook pro and the iMac, the phone would only recognize one of them and ultimately always choose the macbook pro.
iMessage chats still sync just fine but the SMS chats do not any more. I was wondering if anyone else had the same issue, and if they did, are there any fixes?
Thanks,
Jon

Both the mini-displayport plugs and TB plugs are physically compatible which is why you can plug it in.   But if the iMac has a mini-displayport for video it won't work with the TB display.
Check your System Profile to see if it tells you whether you have a TB port.  And if there is no information about that post here or look up for yourself the kind of ports for that model of iMac.  System Profiler will give yo that information (click Hardware on the left).  From the model information it can be definitively determined whether that imac supports TB.
Also, so long as the Displays system preferences is not showing an Arrangement tab then it is not detecting the second display.

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