AutoSSL certificate is unable to be renewed without reduction in coverage

I am getting the following errors when I run AutoSSL :

The system queried for a temporary file at “http://autodiscover.mydomain.com/.well-known/pki-validation/***.txt”, but the web server responded with the following error: 404 (Not Found). A DNS (Domain Name System) or web server misconfiguration may exist.

I get similar error for autodiscover.mydomain.com as well as webdisk.mydomain.com.

Does anyone know why am I getting this error ?

I went to .well-known/pki-validation folder and I saw it is empty.

I searched a lot, but was unable to find out any fruitful solution.

If anyone can let me know why I am getting the error and how I can resolve this, it will help me a lot.

Also, what problem am I going to face if these domains get excluded while renewing AutoSSL ?

I contacted my webhosting provider and I am told as webdisk and autodiscover are services with their own SSL, it won't cause any problem if they get excluded while renewing AutoSSL.

If anyone can give me any information on this, I would be very much helpful.

Thanks,