Not sure if already known but when adding a WebDAV (HTTPS) share, it defaults to port 80.
I had to switch to port 443 manually in the advanced settings.
Can you check to ensure you have selected the WebDAV (HTTPS) option from the dropdown? This will default to port 443.
I did not, but I did add an HTTPS address.
After saving an HTTPS address it automatically changes the Protocol from WebDAV to WebDAV (HTTPS), however the Port doesn’t also auto-update. ^^
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Good catch! This is something we will get tuned up.