diff --git a/server/internal/auth/local.go b/server/internal/auth/local.go
index ecd65f1..9d6b513 100644
--- a/server/internal/auth/local.go
+++ b/server/internal/auth/local.go
@@ -126,7 +126,11 @@ func HandleBootstrap(c *gin.Context) {
 		return
 	}
 	SetSessionCookie(c, sessionID)
-	c.JSON(http.StatusCreated, gin.H{"instance": inst, "slug": inst.Slug})
+	c.JSON(http.StatusCreated, gin.H{
+		"instance":    inst,
+		"slug":        inst.Slug,
+		"instance_id": inst.InstanceID,
+	})
 }
 
 func HandleMe(c *gin.Context) {
diff --git a/web/app/setup/page.tsx b/web/app/setup/page.tsx
index 76b3a6f..2922088 100644
--- a/web/app/setup/page.tsx
+++ b/web/app/setup/page.tsx
@@ -39,7 +39,7 @@ export default function SetupPage() {
     const [password, setPassword] = useState("");
     const [confirm, setConfirm] = useState("");
     const [validationError, setValidationError] = useState<string | null>(null);
-    const [created, setCreated] = useState<{ slug: string; loginUrl: string } | null>(null);
+    const [created, setCreated] = useState<{ slug: string; loginUrl: string; instanceId: string } | null>(null);
 
     useEffect(() => {
         auth.bootstrapStatus()
@@ -56,7 +56,7 @@ export default function SetupPage() {
     } = useMutation({
         mutationFn: () => auth.bootstrap({ instance_name: instanceName, email, password }),
         onSuccess: (res) => {
-            setCreated({ slug: res.slug, loginUrl: instanceLoginUrlForSlug(res.slug) });
+            setCreated({ slug: res.slug, loginUrl: instanceLoginUrlForSlug(res.slug), instanceId: res.instance_id });
         },
     });
 
@@ -93,6 +93,21 @@ export default function SetupPage() {
                             you just chose.
                         </p>
                         <code className="mt-3 block overflow-x-auto rounded bg-surface-2 px-2 py-1.5 font-mono text-xs text-text-primary">{created.loginUrl}</code>
+
+                        <div className="mt-4 rounded border border-border p-3">
+                            <p className="text-xs text-text-tertiary">Instance ID — needed to activate a licence</p>
+                            <div className="mt-1 flex items-center gap-2">
+                                <code className="overflow-x-auto font-mono text-xs text-text-primary">{created.instanceId}</code>
+                                <button
+                                    type="button"
+                                    className="text-xs underline"
+                                    onClick={() => navigator.clipboard.writeText(created.instanceId)}
+                                >
+                                    Copy
+                                </button>
+                            </div>
+                        </div>
+
                         <a href={created.loginUrl} className="mt-5 block">
                             <Button type="button" variant="primary" className="w-full justify-center">
                                 Go to sign in
diff --git a/web/lib/api.ts b/web/lib/api.ts
index 0fe245a..4608f0d 100644
--- a/web/lib/api.ts
+++ b/web/lib/api.ts
@@ -327,6 +327,7 @@ export interface BootstrapStatus {
 export interface BootstrapResponse {
     instance: Instance;
     slug: string;
+    instance_id: string;
 }
 
 export interface InstanceUser {