diff --git a/.changeset/adr-0024-sso-quality.md b/.changeset/adr-0024-sso-quality.md
new file mode 100644
index 0000000000..cd8d27f148
--- /dev/null
+++ b/.changeset/adr-0024-sso-quality.md
@@ -0,0 +1,9 @@
+---
+'@objectstack/plugin-auth': patch
+'@objectstack/platform-objects': patch
+---
+
+Auth: SSO quality polish (ADR-0024 / cloud#551)
+
+- **plugin-auth**: `OS_OIDC_PROVIDER_ENABLED` / `OS_SSO_ENABLED` / `OS_SCIM_ENABLED` now parse with the shared `readBooleanEnv` helper (same as `OS_AUTH_TWO_FACTOR` etc.), so the platform-standard truthy set works (`true`/`1`/`yes`/`on`, case-insensitive) instead of only the literal `'true'` — a repeated operator footgun where `OS_SSO_ENABLED=1` silently parsed as disabled. Added unit tests.
+- **platform-objects**: `sys_sso_provider`'s list view gets a per-object empty state ("No SSO providers yet" + a pointer to "Register SSO Provider"), replacing the shared identity-object copy ("records are created automatically … cannot be added here") which is wrong for this object — it HAS a register action.
diff --git a/packages/platform-objects/src/identity/sys-sso-provider.object.ts b/packages/platform-objects/src/identity/sys-sso-provider.object.ts
index 3fec44f952..53b70ecf57 100644
--- a/packages/platform-objects/src/identity/sys-sso-provider.object.ts
+++ b/packages/platform-objects/src/identity/sys-sso-provider.object.ts
@@ -120,6 +120,14 @@ export const SysSsoProvider = ObjectSchema.create({
       columns: ['provider_id', 'issuer', 'domain', 'created_at'],
       sort: [{ field: 'provider_id', order: 'asc' }],
       pagination: { pageSize: 50 },
+      // Per-object empty state — the shared identity-object copy ("created
+      // automatically … cannot be added here") is wrong for this object, which
+      // HAS a "Register SSO Provider" action. Point admins at it instead.
+      emptyState: {
+        title: 'No SSO providers yet',
+        message: 'Register your organization’s external OIDC IdP (Okta, Entra, Auth0, …) with “Register SSO Provider”. Members whose email domain matches can then sign in through it.',
+        icon: 'log-in',
+      },
     },
   },
 
diff --git a/packages/plugins/plugin-auth/src/auth-manager.test.ts b/packages/plugins/plugin-auth/src/auth-manager.test.ts
index 390ceb82aa..b11c75a3f5 100644
--- a/packages/plugins/plugin-auth/src/auth-manager.test.ts
+++ b/packages/plugins/plugin-auth/src/auth-manager.test.ts
@@ -1149,6 +1149,47 @@ describe('AuthManager', () => {
       }
     });
 
+    // ADR-0024 / cloud#551 — OS_SSO_ENABLED uses the shared `readBooleanEnv`
+    // parser, so the platform-standard truthy/falsy set works (not only the
+    // literal `'true'`). Operators kept setting `OS_SSO_ENABLED=1` and getting
+    // a silently-disabled RP.
+    it.each(['1', 'true', 'TRUE', 'yes', 'on'])(
+      'should treat OS_SSO_ENABLED=%s as enabled',
+      (val) => {
+        const warnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
+        const prev = process.env.OS_SSO_ENABLED;
+        process.env.OS_SSO_ENABLED = val;
+        try {
+          const manager = new AuthManager({ secret: 'test-secret-at-least-32-chars-long' });
+          expect(manager.getPublicConfig().features.sso).toBe(true);
+        } finally {
+          if (prev === undefined) delete process.env.OS_SSO_ENABLED;
+          else process.env.OS_SSO_ENABLED = prev;
+          warnSpy.mockRestore();
+        }
+      },
+    );
+
+    it.each(['0', 'false', 'off', 'no'])(
+      'should treat OS_SSO_ENABLED=%s as disabled even when plugins.sso=true',
+      (val) => {
+        const warnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
+        const prev = process.env.OS_SSO_ENABLED;
+        process.env.OS_SSO_ENABLED = val;
+        try {
+          const manager = new AuthManager({
+            secret: 'test-secret-at-least-32-chars-long',
+            plugins: { sso: true } as any,
+          });
+          expect(manager.getPublicConfig().features.sso).toBe(false);
+        } finally {
+          if (prev === undefined) delete process.env.OS_SSO_ENABLED;
+          else process.env.OS_SSO_ENABLED = prev;
+          warnSpy.mockRestore();
+        }
+      },
+    );
+
     it('should filter out disabled providers', () => {
       const warnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
       const manager = new AuthManager({
diff --git a/packages/plugins/plugin-auth/src/auth-manager.ts b/packages/plugins/plugin-auth/src/auth-manager.ts
index 66a6708dcc..7832433588 100644
--- a/packages/plugins/plugin-auth/src/auth-manager.ts
+++ b/packages/plugins/plugin-auth/src/auth-manager.ts
@@ -1057,12 +1057,14 @@ export class AuthManager {
     // `OS_MULTI_ORG_ENABLED` / `OS_DISABLE_SIGNUP` pattern). When set, the
     // env var WINS over the config-file setting so platform operators can
     // override per-environment without touching the application bundle.
-    const oidcEnv = (globalThis as any)?.process?.env?.OS_OIDC_PROVIDER_ENABLED;
-    const oidcFromEnv = oidcEnv != null ? String(oidcEnv).toLowerCase() === 'true' : undefined;
-    const ssoEnv = (globalThis as any)?.process?.env?.OS_SSO_ENABLED;
-    const ssoFromEnv = ssoEnv != null ? String(ssoEnv).toLowerCase() === 'true' : undefined;
-    const scimEnv = (globalThis as any)?.process?.env?.OS_SCIM_ENABLED;
-    const scimFromEnv = scimEnv != null ? String(scimEnv).toLowerCase() === 'true' : undefined;
+    // Use the shared `readBooleanEnv` parser (same as OS_AUTH_TWO_FACTOR /
+    // OS_AUTH_PASSWORD_REJECT_BREACHED / OS_DISABLE_SIGNUP) so these accept the
+    // platform-standard truthy set (`true`/`1`/`yes`/`on`, case-insensitive)
+    // instead of only the literal string `'true'` — a repeated operator footgun
+    // (`OS_SSO_ENABLED=1` silently parsed as disabled).
+    const oidcFromEnv = readBooleanEnv('OS_OIDC_PROVIDER_ENABLED');
+    const ssoFromEnv = readBooleanEnv('OS_SSO_ENABLED');
+    const scimFromEnv = readBooleanEnv('OS_SCIM_ENABLED');
     // @better-auth/scim's `active:false` → ban runs through the admin plugin,
     // and org-scoped tokens need the organization plugin — so enabling SCIM
     // forces `admin` on (organization already defaults on). See ADR-0071.
@@ -2008,8 +2010,9 @@ export class AuthManager {
    * `planAllowsSso` config, since that arrives via `plugins.sso`).
    */
   public isSsoWired(): boolean {
-    const ssoEnv = (globalThis as any)?.process?.env?.OS_SSO_ENABLED;
-    const ssoFromEnv = ssoEnv != null ? String(ssoEnv).toLowerCase() === 'true' : undefined;
+    // Same parser as `buildPluginList` (`readBooleanEnv`) so the advertised
+    // capability can never disagree with the actually-mounted route.
+    const ssoFromEnv = readBooleanEnv('OS_SSO_ENABLED');
     return ssoFromEnv ?? (this.config.plugins as any)?.sso ?? false;
   }