Query on DNS resolution

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My domain is: dev.tfitaxsaver.ie

I ran this command: sudo certbot certonly --email xxx@yyy.com -d dev.tfitaxsaver.ie --agree-tos --manual

It produced this output:
Failed authorization procedure. dev.tfitaxsaver.ie (http-01): urn:ietf:params:acme:error:unauthorized :: The client lacks sufficient authorization :: Invalid response from http://dev.tfitaxsaver.ie/.well-known/acme-challenge/3p7LUlkX81Ih57gFWHTQjtyxUc9EvLHrGA_116SyINc [20.56.53.64]: "\n\n\n\n<!-- FILE NAME SUGGESTIONS:\n * html--.well-known--acme-challenge--3p7LUlkX8"

IMPORTANT NOTES:

  • The following errors were reported by the server:

    Domain: dev.tfitaxsaver.ie
    Type: unauthorized
    Detail: Invalid response from
    http://dev.tfitaxsaver.ie/.well-known/acme-challenge/3p7LUlkX81Ih57gFWHTQjtyxUc9EvLHrGA_116SyINc
    [20.56.53.64]: "\n\n\n\n<!-- FILE NAME SUGGESTIONS:\n *
    html--.well-known--acme-challenge--3p7LUlkX8"

    To fix these errors, please make sure that your domain name was
    entered correctly and the DNS A/AAAA record(s) for that domain
    contain(s) the right IP address.

My web server is (include version): Azure Web App

The operating system my web server runs on is (include version): Azure Web App

My hosting provider, if applicable, is: Azure

I can login to a root shell on my machine (yes or no, or I don't know): DOn't know

I'm using a control panel to manage my site (no, or provide the name and version of the control panel): No

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot):

Note: Our DNS Records point to a Traffic Manager profile in Azure which has a endpoint of a public load balancer, this forwards traffic through the firewall / app gateway to the Web App. I wonder whether the fact the DNS records don't resolve directly to the web app is the issue?

Thanks

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