Can't Return Challenge for Webhook (Monday.com to Slack Workflow)

Hi I’m a beginner at this, and whenever I try to connect the webhook URL from my slack workflow I’ get an error message that says Failed to communicate with URL provided.


I do get the challenge token in slack after clicking connect but as it appears so, I am unable to return the challenge to Monday.
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Can anyone help me please? What am I doing wrong? :slight_smile: