I am curious – I sent two messages to a friend several weeks ago. Never heard back. Checked my phone and it showed the "not delivered" icons. Later was on the web interface and it had "delivered" icons. Checked the app again and still "not delivered".
A week has gone by and the status on the app and web still do not agree. I have tried clearing my cookies and local storage for the web and even uninstalled/reinstalled the app on my phone. Still no difference.
Which is right?
Best Answer
A message goes through 3 different stages:
The correct message status is the one that is “most advanced,” since it wouldn’t have gotten there without going through earlier stages. Any device that shows an earlier stage may have suffered from a communications/server error at the time Facebook tried to notify it of the message’s status.