I have a service that sends out 10-20 actionable messages every day. Very sporadically (about once a month), someone will not be able to view the message. Instead, they get the fallback message.
I began BCCing myself on all the messages, and it turned out when the user could not read the message, I still could. The user could also view the actionable message in the Outlook web client. Finally, the user could frequently view the actionable message in the Outlook client by restarting Outlook.
When I view the debug message using the Actionable Message debugger on both the client's computer and mine, they both show nearly the same results. Running a diff against the two debug logs, the main difference I see is that several of the JSON properties in his message are not surrounded by double quotes. (Mine is on the left)
Remember that this is the same message. He was in the "To" field, I was in the "Bcc" field.
Again, this is very sporadic. This same user could have received a message from this same service every day last week without issue.
