Azure / LetsEncrypt - Invalid response from host

Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. https://crt.sh/?q=example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.

My domain is: portal.verbruggen-palletizing.com

I ran this command: Azure Let’s Encrypt site extension

It produced this output:

Unable to complete challenge with Lets Encrypt servers error was: {“type”:“http-01”,“url”:"https://acme-v02.api.letsencrypt.org/acme/chall-v3/2640468138/TFyBHQ",“status”:“Invalid”,“validated”:null,“error”:{“Type”:“urn:ietf:params:acme:error:unauthorized”,“Detail”:"Invalid response from http://portal.verbruggen-palletizing.com/.well-known/acme-challenge/ezqUJxCOc9mnfgLavpmrVYbHEJT5pUCrFLNZKOYU4S8*

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

The operating system my web server runs on is (include version): Windows

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): Yes

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

Been looking around for a while but cant find a solution.