422
invalid_transitionplatformThat state transition is not allowed
Returned by the implementation; no specification rule declares it yet.
The object's current state has no edge to the state you asked for.
Why the API refuses
the requested state transition is not allowed
What to do
Read the object and branch on its actual status rather than on what you expected it to be by now. The state machine for each entity is on its schema page in the reference.