Hi, yes I got it to work – but I have no real idea how. Yes, my page and the posts contained meta descriptions. Eventually, on the advice of a friend, I just kept using the URL from different posts until one finally went through. I have absolutely no idea why several didn’t work and then one finally did. I tried to compare the one that worked to the ones that hadn’t and I didn’t see any difference.
So, my only advice is: keep trying different posts until one of them works!