I'm glad that you were able to resolve your issue and thank you for posting your solution so that others experiencing the same thing can easily reference this!
Since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others", I'll repost your solution in case you'd like to "Accept" the answer.
Issue:
- You have delegated your Domain to Azure DNS.
- You have configured the DNS Zone to have a record for an Azure VM running IIS.
Solution:
- This was found to be an issue from the 3rd party service.
- Post redeploying, you confirmed the issue has been mitigated.
Thanks for your continued contribution on Q&A and appreciate much for taking the time to share your feedback.
Cheers,
Kapil.
Please remember to "Accept Answer" if any answer/reply helped, so that others in the community facing similar issues can easily find the solution.