Am I going crazy?

I can’t seem to find a list of actions to install on OH3 UI?

I need to check if i have the mqttaction installed.

Many thanks

This actual mqtt version does not need a dedicated action binding.
You can send mqtt messages with (ECMA) code like:

var device_id = "Tasmota";
var actionsBroker = actions.get("mqtt", "mqtt:broker:opuspi4MQTTBroker");
var mycommand=command.toString();
 actionsBroker.publishMQTT("cmnd/" + device_id + "/restart", "1");
    
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Put it another way; there are no standalone add-on Actions in OH3.
Though many bindings supply Actions as one of their features.

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Your rule has no title, this is mandatory for files based rules.
When in doubt, add some logInfo() to at least find out if your rule ever runs.

I got it working, thanks