I have reformatted my MBPr/MBP (have both) multiple times and now, they are also appearing multiple times on my iPhone (Setting => iMessage => Text Forwarding).
Any ideas on how to remove duplicate/unused ones? Thank you
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Let me know if I'm not understanding your question correctly, but here are 3 interpretations of what I think you're asking, along with solutions to each.
1.) You want messages you delete/read on one device to also be deleted/read on all the others:
Note: this will disable the ability to send SMS from your Mac via your iPhone, but it shouldn't debilitate you too much since you can still send SMS from the iPhone itself. Again, if the receiver also uses an Apple Device, you'll still be able to send them iMessages from either iPhone or Mac.
2.) If you're experiencing "grouped" messages, when the only people in the group are you and the person you're sending a message to:
3.) If you're wanting to receive text to just one device instead of all devices:
HOPE THAT HELPS!
I also had multiple macbooks showing in my "Text Message Forwarding" preference screen, it was showing 7 macbooks even though there were only 2 on the "Manage your APPLE Id" web page.
Although I was unsuccessful in removing them from the text message pref screen, I did discover that since activating any of them requires you to type in the code shown on your macbook, it becomes clear which one is the macbook you want to connect with, because either the mac opens the messages app and shows you a code, or it doesn't and you just deselect that device from the app and try the next one!
As a tip it's worth trying the bottom device first, as that was the one for me—presumably because they're in order of when they were first set up, so it was the latest one I'd signed in to.