Timeout from Shortcuts app when calling mqtt.publish service

Am I missing anything? In a shortcut I want to call the mqtt.publish service but it just doesn‘t work. I‘m always getting a timeout:

(The payload is another dictionary for the Ulanzi clock with Awtrix firmware.)

Maybe I‘m doing something wrong in constructing the dictionary for the mqtt.publish service?
Where can I find the documentation for how to build the JSON dictionary for the mqtt.publish service? :flushed:

Now I don’t get the timeout anymore, didn’t change anything. Weird.
So, case closed for now. :man_shrugging:

Same. A shortcut (that just turns on a HA script) suddenly timeouts, after working for literally years. Nothing in log at all.