No such run, or you do not own it.
One of three reasons, each its own message: the run is not running, so there is nothing to tell;
this run's compiled strategy has no record of whether it handles commands — register the strategy
again with POST /strategy and start a new run, since a run keeps the compiled version it started
with; or the strategy does not implement CommandRequestHandler at all.
The request body is larger than 2 KiB (2048 bytes). Every endpoint that reads a request body caps it, and the message names the cap.
The command could not be delivered right now, and it was not sent — unlike a parameter update, a command has no fallback path. Try again.
commandmissing, not a string, blank;propertiesgiven but not an object; or the body carries any key other thancommandandproperties.