diff --git a/WORK-RECORDS.md b/WORK-RECORDS.md
index 19eabe4..d433e63 100644
--- a/WORK-RECORDS.md
+++ b/WORK-RECORDS.md
@@ -30,6 +30,8 @@
 | workplan | NK-WP-0034 | blocked | — | workplans/NK-WP-0034-verification-that-verifies.md |
 | workplan | NK-WP-0035 | blocked | — | workplans/NK-WP-0035-emission-cadence-security-profile.md |
 | workplan | NK-WP-0036 | active | — | workplans/NK-WP-0036-restore-user-portal-client-registration.md |
+| workplan | NK-WP-0037 | active | — | workplans/NK-WP-0037-vergabe-company-welcome.md |
+| workplan | NK-WP-0038 | finished | — | workplans/NK-WP-0038-tenant-scoped-identity-lifecycle.md |
 | task | NK-WP-ADHOC-2026-07-02-T01 | done | — | workplans/ADHOC-2026-07-02.md |
 | task | NK-WP-ADHOC-2026-07-02-T02 | done | — | workplans/ADHOC-2026-07-02.md |
 | task | NK-WP-ADHOC-2026-08-14-T01 | done | — | workplans/ADHOC-2026-08-14.md |
@@ -134,6 +136,11 @@
 | task | NK-WP-0036-T03 | done | — | workplans/NK-WP-0036-restore-user-portal-client-registration.md |
 | task | NK-WP-0036-T04 | done | — | workplans/NK-WP-0036-restore-user-portal-client-registration.md |
 | task | NK-WP-0036-T05 | todo | — | workplans/NK-WP-0036-restore-user-portal-client-registration.md |
+| task | NK-WP-0036-T06 | done | — | workplans/NK-WP-0036-restore-user-portal-client-registration.md |
+| task | NK-WP-0037-T01 | done | — | workplans/NK-WP-0037-vergabe-company-welcome.md |
+| task | NK-WP-0037-T02 | progress | — | workplans/NK-WP-0037-vergabe-company-welcome.md |
+| task | NK-WP-0038-T01 | done | — | workplans/NK-WP-0038-tenant-scoped-identity-lifecycle.md |
+| task | NK-WP-0038-T02 | done | — | workplans/NK-WP-0038-tenant-scoped-identity-lifecycle.md |
 | intake | NK-IN-0001 | closed | blue | docs/intakes/activity-core-ops-sso-operators.md |
 | intake | NK-IN-0002 | closed | blue | docs/intakes/activity-core-ops-sso-operators.md |
 | intake | NET-IN-0001 | open | — | intakes/intakes.md |
diff --git a/sso-mfa/k8s/keycape/create-secrets.sh b/sso-mfa/k8s/keycape/create-secrets.sh
index 8c98cf9..3f26c3d 100644
--- a/sso-mfa/k8s/keycape/create-secrets.sh
+++ b/sso-mfa/k8s/keycape/create-secrets.sh
@@ -117,6 +117,7 @@ clients:
     displayName: User Engine Portal
     redirectUris:
     - https://users.92-205-62-239.nip.io/oidc/callback
+    - https://users.coulomb.social/oidc/callback
     allowedScopes:
     - openid
     - profile
diff --git a/sso-mfa/k8s/keycape/portal-client-rollout.py b/sso-mfa/k8s/keycape/portal-client-rollout.py
index 8557de9..da4ee2d 100644
--- a/sso-mfa/k8s/keycape/portal-client-rollout.py
+++ b/sso-mfa/k8s/keycape/portal-client-rollout.py
@@ -12,7 +12,7 @@ import subprocess
 
 import yaml
 
-ROOT = Path('/home/worsch/net-kingdom/sso-mfa/k8s/keycape')
+ROOT = Path(__file__).resolve().parent
 
 
 def module(name, filename):
@@ -43,9 +43,32 @@ def replacement(secret):
     ids = [client['clientId'] for client in clients]
     require(len(ids) == len(set(ids)), 'duplicate_client_id')
     if portal.CLIENT_ID in ids:
-        require(clients[ids.index(portal.CLIENT_ID)] == portal.CLIENT,
-                'existing_registration_differs_requires_reconciliation')
-        return secret['data']['config.yaml'], False
+        current = clients[ids.index(portal.CLIENT_ID)]
+        if current == portal.CLIENT:
+            return secret['data']['config.yaml'], False
+        legacy = dict(portal.CLIENT, redirectUris=[
+            'https://users.92-205-62-239.nip.io/oidc/callback'])
+        require(current == legacy, 'existing_registration_differs_requires_reconciliation')
+        # Only the exact reviewed legacy public client may gain this callback.
+        root = yaml.compose(raw)
+        node = next(value for key, value in root.value if key.value == 'clients')
+        item = node.value[ids.index(portal.CLIENT_ID)]
+        redirects = next(value for key, value in item.value if key.value == 'redirectUris')
+        require(isinstance(redirects, yaml.nodes.SequenceNode) and not redirects.flow_style,
+                'block_redirect_sequence_required')
+        index = redirects.end_mark.index
+        line_start = raw.rfind('\n', 0, index) + 1
+        if not raw[line_start:index].strip():
+            index = line_start
+        addition = ' ' * redirects.start_mark.column + '- https://users.coulomb.social/oidc/callback\n'
+        if index and raw[index - 1] != '\n':
+            addition = '\n' + addition
+        updated = raw[:index] + addition + raw[index:]
+        expected = copy.deepcopy(config)
+        expected['clients'][ids.index(portal.CLIENT_ID)] = portal.CLIENT
+        require(yaml.load(updated, Loader=pin.UniqueLoader) == expected,
+                'unrelated_configuration_changed')
+        return base64.b64encode(updated.encode()).decode(), True
     root = yaml.compose(raw)
     node = next(value for key, value in root.value if key.value == 'clients')
     require(isinstance(node, yaml.nodes.SequenceNode) and not node.flow_style,
diff --git a/sso-mfa/k8s/keycape/register-user-engine-portal.py b/sso-mfa/k8s/keycape/register-user-engine-portal.py
index 57d82b6..3fe6eab 100644
--- a/sso-mfa/k8s/keycape/register-user-engine-portal.py
+++ b/sso-mfa/k8s/keycape/register-user-engine-portal.py
@@ -17,7 +17,8 @@ CLIENT_ID = "user-engine-portal"
 CLIENT = {
     "clientId": CLIENT_ID,
     "displayName": "User Engine Portal",
-    "redirectUris": ["https://users.92-205-62-239.nip.io/oidc/callback"],
+    "redirectUris": ["https://users.92-205-62-239.nip.io/oidc/callback",
+                     "https://users.coulomb.social/oidc/callback"],
     "allowedScopes": ["openid", "profile", "email", "groups"],
     "grantTypes": ["authorization_code"],
     "clientType": "public",
diff --git a/sso-mfa/k8s/keycape/test_portal_client_rollout.py b/sso-mfa/k8s/keycape/test_portal_client_rollout.py
index 825d6f6..01b73a1 100644
--- a/sso-mfa/k8s/keycape/test_portal_client_rollout.py
+++ b/sso-mfa/k8s/keycape/test_portal_client_rollout.py
@@ -32,6 +32,25 @@ class PortalClientTests(unittest.TestCase):
         self.assertEqual(yaml.safe_load(updated), expected)
         self.assertEqual(secret['data']['key.pem'], 'synthetic-key')
 
+    def test_legacy_callback_upgrade_preserves_bytes_and_is_idempotent(self):
+        legacy = dict(rollout.portal.CLIENT, redirectUris=[
+            'https://users.92-205-62-239.nip.io/oidc/callback'])
+        secret, raw = self.fixture([{'clientId': 'existing', 'clientType': 'public'}, legacy])
+        encoded, changed = rollout.replacement(secret)
+        updated = base64.b64decode(encoded).decode()
+        self.assertTrue(changed)
+        self.assertEqual(updated.replace('  - https://users.coulomb.social/oidc/callback\n', ''), raw)
+        self.assertEqual(yaml.safe_load(updated)['clients'][-1], rollout.portal.CLIENT)
+        secret['data']['config.yaml'] = encoded
+        self.assertEqual(rollout.replacement(secret), (encoded, False))
+
+    def test_upgrade_refuses_extra_scope_or_unreviewed_callback(self):
+        for extra in [dict(allowedScopes=['openid', 'admin']),
+                      dict(redirectUris=['https://users.coulomb.social/oidc/callback']),
+                      dict(clientType='confidential')]:
+            with self.subTest(extra=extra), self.assertRaises(rollout.Refused):
+                rollout.replacement(self.fixture([dict(rollout.portal.CLIENT, **extra)])[0])
+
     def test_exact_existing_registration_is_noop(self):
         secret, _ = self.fixture([rollout.portal.CLIENT])
         self.assertEqual(rollout.replacement(secret), (secret['data']['config.yaml'], False))
diff --git a/workplans/NK-WP-0036-restore-user-portal-client-registration.md b/workplans/NK-WP-0036-restore-user-portal-client-registration.md
index 2c64596..8c2492f 100644
--- a/workplans/NK-WP-0036-restore-user-portal-client-registration.md
+++ b/workplans/NK-WP-0036-restore-user-portal-client-registration.md
@@ -8,7 +8,7 @@ status: active
 owner: the-custodian
 topic_slug: netkingdom
 created: "2026-09-11"
-updated: "2026-09-11"
+updated: "2026-09-12"
 related: [KEY-WP-0007, RAPPS-WP-0014, VERGABE-WP-0019]
 state_hub_workstream_id: "6e1358d6-87e4-52e7-b3dd-09abdc48cefc"
 ---
@@ -155,3 +155,24 @@ lane, then verify provider login, user creation/linkage and password setup as a
 single native onboarding journey. Preserve credential secrecy and avoid
 unbounded password-check retries. Actual demo users and application admission
 remain RAPPS-WP-0014 and VERGABE-WP-0019.
+
+
+## Admit the canonical users hostname and preserve callback validation
+
+```task
+id: NK-WP-0036-T06
+status: done
+priority: high
+state_hub_task_id: "d736f4d1-1c97-5cf3-894e-600ea113c785"
+```
+
+Operator supplied DNS for users.coulomb.social on 2026-09-12. The contained
+portal-client-rollout helper now upgrades only the exact legacy public client
+by appending https://users.coulomb.social/oidc/callback. It preserves unrelated
+configuration bytes and Secret fields; six synthetic tests pass, including
+idempotence and refusal of altered scopes/type/callbacks. The bootstrap and
+registration declarations agree. Server dry-run passed; guarded Secret revision
+59999030 became 60090393, UID unchanged. KeyCape restarted at its unchanged
+image/resources. Canonical authorize redirects to Authelia; wrong callback and
+missing PKCE return 400. The runtime package owns portal routing and callback
+cutover; final human login confirmation is recorded there. No password rotated.