I have the same host, contacted support, and here was their response:
The access to the public_html/.well-known folder is not blocked on our servers.
However, the folder was not present at all in your document root folder.
I have created the folder, but the issue still persists.
From the answer of the plugin developers, I see that there is no need to actually have files there, as there will be a redirect, using mod-rewrite.
I do not see, however, any rules in the .htaccess file, indicating that the virtual path has been created by the plugin.
That being said, I recommend contacting the plugin developers again, in order to determine the rules that need to be added to your .htaccess in order for the plugin to work as expected.
So… what should go in there? Understanding, yes, all of that should have magically happened on plugin install, but it didn’t.
