try

system-config/services/containers/netbird/default.nix

@@ -86,6 +86,19 @@
                                 #turnDomain = "localhost";
 
                                 disableAnonymousMetrics = true;
+
+                                settings = {
+                                    Signal = {
+                                        Proto = "http";
+                                        URI = "vpn.blunkall.us:443";
+                                    };
+
+                                    HttpConfig = {
+                                        Address = "0.0.0.0:443";
+                                        AuthIssuer = "https://auth.blunkall.us/application/o/netbird/.well-known/openid-configuration";
+                                        AuthAudience = "wXR2HlT7fOmDGRbB8FOJP4BaX1u0UF1mo2hLrFlD";
+                                    };
+                                };
                             };
 
                             dashboard = {