Getting error trying to connect via WebDav

Hello experts.

I read the instructions and started the wizard same as described in step 1.
In step 2 I have to enter the url and clicking on "next", and the problem emerged.

Each time I have to enter the URL, so I copy & paste it from the instructions, but Windows still telling me:

The entered folder is not valid, please try another one.
The URL is: https://andyk.webdav.hidrive.strato.com/
I don’t found any problem if I'm connecting via Firefox and capable to Log in and browse the folders.

Is there anything wrong I have made? Keep suggests me please.

Thanks.