How do I host the MTA-STS policy file URL on IIS?

A long while has been trapped on Mainkya Chaypa (badly trapped) during the configuration of the MTA-STS Policy File for SEOsiri on IIS and the only problem is with URL Path after the .well-known folder.

Wrong URL - https://mta-sts.seosiri.com/.well-knownmta-sts.txt
Desired URL - https://mta-sts.seosiri.com/.well-known/mta-sts.txt

Seeking support to host the MTA-STS Policy URL on IIS for the Desired URL - https://mta-sts.seosiri.com/.well-known/mta-sts.txt

Let me know the unfolding of the right path either here- https://dev.to/seosiri/how-do-i-host-the-mta-sts-policy-url-on-iis-2ag or there- https://qr.ae/pK02w4

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Thank you
Momenul Ahmad