I have attempted to follow the instructions in the "IIS Settings Changes (Manual Install" section of the Wiki doc for Exchange 2016. I have been unable to create the .well-known folder under wwwroot, as Explorer tells me that I need to add a filename.

If you could expand on how you're doing that creation, I'd greatly appreciate it.
Thanks
Explorer won't let you create a folder or a file without a name.
However you can either do it via the command line mkdir .well-known or you can create it as .well-known. in Windows Vista and greater in Explorer.
Thanks, good sir. That did the trick and I have successfully followed the rest of the guide. I appreciate the help.
Thanks, good sir. That did the trick and I have successfully followed the rest of the guide. I appreciate the help.
How were you able to install the other files from certbot into the web server directory???
I have exactly same issue
Most helpful comment
Explorer won't let you create a folder or a file without a name.
However you can either do it via the command line
mkdir .well-knownor you can create it as.well-known.in Windows Vista and greater in Explorer.