I'm sure you've already tried this but I've had several that won't see DSM's until you actually plug a digital set in. Then it sees it every time. Just a thought...
I have tried all of these things and more. The machines are at 3.6, and all other MBM's work just fine. I am about to conclude that it is an MSC issue.
I had the exact same problem and indeed is was simply that there were no actual phones attached to the card. Once I attached the first phone to the card, the card registered forever more.
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