Access to Nextcloud via VPN Manager

Hello,

I try to replicate my contacts between my Nextcloud container on Unraid and my phone (DAVx5). Therefore I want to get access to my Nextcloud with a VPN but I am not sure with my settings and how to go on.

It would be great if someone could please help me.

What I have done so far:

1. I configured the VPN Manager with a duckdns with port 51820 and added a peer for my smartphone. Then I scanned the QR code with my phone (WireGuard App).

2. In addition to that I configured my fritzbox 7490.

- I could choose between two unraid devices with the same IPv4 address but different IPv6 addresses. Which one should I choose or is there no difference? I changed a usb stick in the beginning and maybe that could be the reason why I have two devices there.

- I choose the following port sharing settings. Is this correct

Port to device: 51820 through... 51820

Port requested externaly (IPv4 only) 51820

- Do I have to pay attention for https or is this not important when using VPN? Where can I check this settings?

3. In the WireGuard App I can see that there is a data transfer, so I can send and receive data. Probably it works or?

My assumption is when I enter my duckdns.org url in the browser of my phone (wifi is deactivated, VPN in WireGuard is activated) that the Login page of unraid will appear, is this correct? Because this is not happening.

My goal is that I can replicate my contacts between Nextcloud and my phone. Which data do I have to maintain in DAVx5. Nextcloud runs in a docker container on unraid. So can I enter the duckdns.org url with the Nextcloud port or which settings do I have to maintain?

Thank you for your support