Pocketid in home server as IdP for Netbird in VPS

I have Pocketid installed at home in an LXC container in Proxmox that sits behind an NPM reverse proxy that provides certificates for my internal services. I use Adguard as DNS to direct internal requests to the reverse proxy.

I have the netbird agent installed on the same proxmox and configured as a routing peer. I have also added thew Adguard DNS in Netbird as a nameserver and all Netbird clients can access internal resources with the internal domain names without problem through the netbird tunnel.

However, when I try to configure Pocketid as identity provider in Netbird it says that the address is unreachable, both if I use the local domain or local IP.

Is there a way to achieve this? Would apprentice any pointers to the missing pieces.