40016: Invalid message name

A message supplied a name that was invalid, so the message was rejected.

What you should do

Set the message name to a string, or leave it unset. Correct the value and republish.

Why it happens

The name supplied on a message was not a string. The name is an optional label for the event, and when present it must be a string.

What you'll see

The error is reported with code 40016 and HTTP status 400. The message is Invalid message name.