I am having a slightly different issue for Core 12.
For about every fourth patient when I send their summary to the portal, I get the following error message:

Failure sending message to Updox patient portal account for PATIENT NAME: Portal Account Not Found (error code:6)

When that happens, of course, I fail that measure for that patient. I have looked at the demographic page and don't see any reason that information is incorrect. I am using version 7.1.3. I am trying to send the summary to the portal for every patient, so I hit the 50% threshold for success. I get nervous when I have too many of these errors.

Anyone know why this is happening and what I can do about it.

Thanks,