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The "email" channel is not supported when using Symfony Messenger

Getting this error message?

The "email" channel is not supported.

I was getting the above error and the trace log showed

      "namespace": "Symfony\\Component\\Notifier",
      "short_class": "Notifier",
      "class": "Symfony\\Component\\Notifier\\Notifier",
      "type": "->",
      "function": "getChannels",
      "file": "/app/vendor/symfony/notifier/Notifier.php",
      "line": 47,
      "args": [

Can you see what it is yet? Yep! - I've not added a recipient to the notification 🤦‍♂️

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