note that sso is not supported for ND auth

src/i18n/locales/en.json

@@ -332,6 +332,7 @@
             "input_legacyAuthentication": "Enable legacy authentication",
             "input_name": "Server Name",
             "input_password": "Password",
+            "input_passwordNoSSO": "Reverse proxy (SSO) authentication is not supported. Only username/password authentication and Subsonic authentication are supported",
             "input_preferInstantMix": "Prefer Instant Mix",
             "input_preferInstantMixDescription": "Only use instant mix to get similar songs. Useful if you have plugins that modify this behavior",
             "input_preferRemoteUrl": "Prefer Public URL",

src/renderer/features/servers/components/add-server-form.tsx

@@ -295,6 +295,10 @@ export const AddServerForm = ({ onCancel }: AddServerFormProps) => {
                         {...form.getInputProps('username')}
                     />
                     <PasswordInput
+                        description={
+                            form.values.type === ServerType.NAVIDROME &&
+                            t('form.addServer.input', { context: 'passwordNoSSO' })
+                        }
                         label={t('form.addServer.input', {
                             context: 'password',
                         })}