The Check URL is Valid function should be working - it validates URLs by checking their response status and marks them as valid/invalid based on whether the site is reachable. [1]
What specific issues are you seeing? Are you getting error messages, or is it not returning the expected results? A screenshot or table link would help me troubleshoot what's going wrong.
You can click into the specific cell where you're seeing the error to expose more details about the error message. This should show you what's actually causing the URL validation to fail.
Can you try that and let me know what specific error details you see?
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I have flagged this as a bug for our team Josh - to get you unblocked here for now, I can see that if I append "https://" to the domain, it's able to validate these urls. I'd recommend trying this method to see if this works as expected: