I apologize for the confusion earlier. It appears that you're using Prefect Cloud, which uses the Automations interface for notifications instead of the Notifications page I mentioned earlier. Here's the correct way to set up Slack notifications for Prefect Cloud with a Kubernetes agent: 1. Go to the Automations page in Prefect Cloud. 2. Select Create Automation or the + button. 3. Choose a trigger for the automation, such as "Flow Run State Change." 4. Configure the trigger by selecting the desired state (e.g., "Failed") and any tags to filter which flow runs are covered by the automation. 5. Add an action for the automation, such as "Send a Slack message." 6. Configure the action by providing the webhook credentials for your Slack and the channel to which the message should be sent. Please note that the error message you received indicates that the notification block was invalid. Make sure you're using the correct dispatch key for the Slack webhook in your automation configuration. I hope this clears up the confusion. Remember, even robots make mistakes sometimes.