ReadyNAS NV+ webdav with Windows 10

All,

I'm having issues connecting to my ReadyNAS NV+ from Windows 10.  I can connect to it via my Android devices using Solid Explorer, so the interface obviously works.

Anyway this is the process I've tried:

Windows Explorer - > Map Network Drive

Select "Connect to a Web site that you can use to store your documents and pictures"

Next

Highlight "Choose a custom network location"

Click Next

Specify the location of your website:

I've got an Afraid URL pointing at my Readynas so the address looks like

"https://me.afraid.org/chris/"

Entering that and selecting next results in a dialog box with the following:

Select Certificate

Issued to  Issued by                           Intended Purpose       Friendly Name Expiration Location

xxxxxxx    Token Signing Public Key  Client Authentication  None                8/22/2016 Not Available

xxxxxxx    Token Signing Public Key  Client Authentication  None                11/1/2014 Not Available

xxxxxxx    Token Signing Public Key  Client Authentication  None                11/9/2014 Not Available 

I've tried all three and when Windows gets done thinking I get:

"The folder you have chosen does not appear to be valid.  Please choose another"

I've viewed the certificates in the window and accepted them to no avail.

Any help working this through would be appreciated as I'd like to enable this for my family to use to remotely back up their personal computers.

I've had Webdav working on Windows 7 and 8 boxes before.

Chris