diff --git a/.env.example b/.env.example
index 8ae2ba8..b7fa742 100644
--- a/.env.example
+++ b/.env.example
@@ -21,5 +21,6 @@ NODE_ENV=development
 APP_PORT=5173
 
 JWT_SECRET=devsecretforjwtencryptionchangeforproduction
+MANAGEMENT_DOMAIN=management.example.com
 
 DATABASE_URL="postgres://$POSTGRES_USER:$POSTGRES_PASSWORD@localhost:$POSTGRES_PORT/$POSTGRES_DB"
diff --git a/.github/workflows/main-deploy.yml b/.github/workflows/main-deploy.yml
index 28fa644..ca8e0eb 100644
--- a/.github/workflows/main-deploy.yml
+++ b/.github/workflows/main-deploy.yml
@@ -42,6 +42,7 @@ jobs:
           SMTP_FROM_NAME: "Open Reception"
           SMTP_FROM_EMAIL: "noreply@example.com"
           JWT_SECRET: "test"
+          MANAGEMENT_DOMAIN: "example.com"
 
       - name: Build application
         run: npm run build
@@ -55,6 +56,7 @@ jobs:
           SMTP_FROM_NAME: "Open Reception"
           SMTP_FROM_EMAIL: "noreply@example.com"
           JWT_SECRET: "test"
+          MANAGEMENT_DOMAIN: "example.com"
       # - name: Install Playwright browsers
       #   run: npx playwright install --with-deps
 
@@ -70,3 +72,4 @@ jobs:
       #     SMTP_FROM_NAME: "Open Reception"
       #     SMTP_FROM_EMAIL: "noreply@example.com"
       #     JWT_SECRET: "test"
+      #     MANAGEMENT_DOMAIN: "example.com"
diff --git a/.github/workflows/pr-checks.yml b/.github/workflows/pr-checks.yml
index d899ebe..a0ac18d 100644
--- a/.github/workflows/pr-checks.yml
+++ b/.github/workflows/pr-checks.yml
@@ -70,6 +70,7 @@ jobs:
           SMTP_FROM_NAME: "Open Reception"
           SMTP_FROM_EMAIL: "noreply@example.com"
           JWT_SECRET: "test"
+          MANAGEMENT_DOMAIN: "example.com"
 
   build:
     runs-on: ubuntu-latest
@@ -99,3 +100,4 @@ jobs:
           SMTP_FROM_NAME: "Open Reception"
           SMTP_FROM_EMAIL: "noreply@example.com"
           JWT_SECRET: "test"
+          MANAGEMENT_DOMAIN: "example.com"
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 9601294..4f8486f 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -50,12 +50,14 @@ jobs:
           SMTP_FROM_NAME: "Open Reception"
           SMTP_FROM_EMAIL: "noreply@example.com"
           JWT_SECRET: "test"
+          MANAGEMENT_DOMAIN: "example.com"
 
       - name: Build application
         run: npm run build
         env:
           DATABASE_URL: "postgresql://test:test@localhost:5432/test"
           JWT_SECRET: "build"
+          MANAGEMENT_DOMAIN: "example.com"
 
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
diff --git a/docker-compose.prod.yml b/docker-compose.prod.yml
index db303b1..dff263c 100644
--- a/docker-compose.prod.yml
+++ b/docker-compose.prod.yml
@@ -61,6 +61,7 @@ services:
       - smtp_from_name
       - smtp_from_email
       - jwt_secret
+      - management_domain
     depends_on:
       postgres:
         condition: service_healthy
@@ -93,6 +94,7 @@ services:
         export SMTP_FROM_NAME=$$(cat /run/secrets/smtp_from_name)
         export SMTP_FROM_EMAIL=$$(cat /run/secrets/smtp_from_email)
         export JWT_SECRET=$$(cat /run/secrets/jwt_secret)
+        export MANAGEMENT_DOMAIN=$$(cat /run/secrets/management_domain)
         exec node build/index.js
       "
     read_only: true
diff --git a/src/lib/server/auth/__tests__/registration-bootstrap.test.ts b/src/lib/server/auth/__tests__/registration-bootstrap.test.ts
index f29467a..fc7a7e3 100644
--- a/src/lib/server/auth/__tests__/registration-bootstrap.test.ts
+++ b/src/lib/server/auth/__tests__/registration-bootstrap.test.ts
@@ -3,6 +3,7 @@ import { describe, it, expect, vi } from "vitest";
 vi.mock("$env/dynamic/private", () => ({
   env: {
     JWT_SECRET: "test-jwt-secret-for-registration-bootstrap-unit-tests-minimum-32-chars",
+    MANAGEMENT_DOMAIN: "example.com",
   },
 }));
 
diff --git a/src/lib/server/auth/booking-access-token.ts b/src/lib/server/auth/booking-access-token.ts
index b5b3823..1d874a5 100644
--- a/src/lib/server/auth/booking-access-token.ts
+++ b/src/lib/server/auth/booking-access-token.ts
@@ -14,6 +14,10 @@ export type BookingAccessScope =
   | typeof EXISTING_CLIENT_BOOKING_SCOPE
   | typeof NEW_CLIENT_BOOTSTRAP_SCOPE;
 
+if (!process.env.BUILDING && !env.MANAGEMENT_DOMAIN) {
+  throw new Error("Mandatory ENV variable MANAGEMENT_DOMAIN is missing!");
+}
+
 if (!process.env.BUILDING && !env.JWT_SECRET) {
   throw new Error("Mandatory ENV variable JWT_SECRET is missing!");
 }
diff --git a/src/lib/server/services/user-service.ts b/src/lib/server/services/user-service.ts
index ef042cc..605aa09 100644
--- a/src/lib/server/services/user-service.ts
+++ b/src/lib/server/services/user-service.ts
@@ -13,6 +13,7 @@ import {
   hashPassphrase,
   validatePassphraseStrength,
 } from "../utils/passphrase";
+import { env } from "$env/dynamic/private";
 import { sendConfirmationEmail } from "../email/email-service";
 import type { SelectTenant } from "../db/central-schema";
 import { TenantAdminService } from "./tenant-admin-service";
@@ -182,16 +183,23 @@ export class UserService {
         hasRecoveryPassphrase: !!insertedUser.recoveryPassphrase,
       });
 
+      if (!env.MANAGEMENT_DOMAIN) {
+        throw new InternalError(`MANAGEMENT_DOMAIN is missing`);
+      }
+
       // Send confirmation email to user (token is used as confirmation code)
       try {
         if (insertedUser?.email && inviteResult?.inviteCode) {
           const tenant = await getTenantForUser(insertedUser);
+          const linkUrl = dev
+            ? requestUrl
+            : new URL(`https://${tenant.id === "system" ? env.MANAGEMENT_DOMAIN : tenant.domain}`);
           await sendConfirmationEmail(
             insertedUser,
             tenant,
             inviteResult.inviteCode,
             10, // 10 minutes expiration to match tokenValidUntil
-            requestUrl,
+            linkUrl,
           );
           log.debug("Confirmation email sent successfully", {
             userId: insertedUser.id,
@@ -239,10 +247,16 @@ export class UserService {
         throw new NotFoundError(`Could not resend confirmation mail for unknown user ${email}`);
       }
 
+      if (!env.MANAGEMENT_DOMAIN) {
+        throw new InternalError(`MANAGEMENT_DOMAIN is missing`);
+      }
+
       // Send confirmation email with new token - use tenant-specific branding if available
       try {
         const tenant = await getTenantForUser(user);
-        const linkUrl = dev ? requestUrl : new URL(`https://${tenant.domain}`);
+        const linkUrl = dev
+          ? requestUrl
+          : new URL(`https://${tenant.id === "system" ? env.MANAGEMENT_DOMAIN : tenant.domain}`);
         await sendConfirmationEmail(
           user,
           tenant,
diff --git a/src/routes/api/auth/challenge/__tests__/challenge-bootstrap.test.ts b/src/routes/api/auth/challenge/__tests__/challenge-bootstrap.test.ts
index 491ca39..1b07281 100644
--- a/src/routes/api/auth/challenge/__tests__/challenge-bootstrap.test.ts
+++ b/src/routes/api/auth/challenge/__tests__/challenge-bootstrap.test.ts
@@ -6,6 +6,7 @@ vi.mock("$env/dynamic/private", () => ({
   env: {
     JWT_SECRET: "test-jwt-secret-for-registration-bootstrap-unit-tests-minimum-32-chars",
     NODE_ENV: "test",
+    MANAGEMENT_DOMAIN: "example.com",
   },
 }));
 
diff --git a/src/routes/api/auth/register/__tests__/register-bootstrap.test.ts b/src/routes/api/auth/register/__tests__/register-bootstrap.test.ts
index 783fc67..3bff0e6 100644
--- a/src/routes/api/auth/register/__tests__/register-bootstrap.test.ts
+++ b/src/routes/api/auth/register/__tests__/register-bootstrap.test.ts
@@ -6,6 +6,7 @@ vi.mock("$env/dynamic/private", () => ({
   env: {
     JWT_SECRET: "test-jwt-secret-for-registration-bootstrap-unit-tests-minimum-32-chars",
     NODE_ENV: "test",
+    MANAGEMENT_DOMAIN: "example.com",
   },
 }));