diff --git a/apps/cli/src/commands/config/pull/pull.integration.test.ts b/apps/cli/src/commands/config/pull/pull.integration.test.ts
index 7bcf2433b1..2c40961777 100644
--- a/apps/cli/src/commands/config/pull/pull.integration.test.ts
+++ b/apps/cli/src/commands/config/pull/pull.integration.test.ts
@@ -194,7 +194,7 @@ function v2Response(
       mailer_notifications_mfa_factor_enrolled_enabled: false,
       mailer_notifications_mfa_factor_unenrolled_enabled: false,
       external_phone_enabled: false,
-      sms_autoconfirm: false,
+      sms_autoconfirm: true,
       sms_max_frequency: 5,
       sms_otp_exp: 60,
       sms_otp_length: 6,
diff --git a/apps/cli/src/commands/config/push/push.encoders.ts b/apps/cli/src/commands/config/push/push.encoders.ts
index ac2158ea44..09f8e88faf 100644
--- a/apps/cli/src/commands/config/push/push.encoders.ts
+++ b/apps/cli/src/commands/config/push/push.encoders.ts
@@ -1334,7 +1334,7 @@ export const PUSH_AUTH_LEAF_MAP: ReadonlyArray<PushAuthLeafSpec> = [
   {
     configPath: ["auth", "sms", "enable_confirmations"],
     apiKey: "sms_autoconfirm",
-    transform: asBoolean,
+    transform: invert,
   },
   { configPath: ["auth", "sms", "template"], apiKey: "sms_template", transform: asString },
   { configPath: ["auth", "sms", "otp_length"], apiKey: "sms_otp_length", transform: asNumber },
diff --git a/apps/cli/src/commands/config/push/push.encoders.unit.test.ts b/apps/cli/src/commands/config/push/push.encoders.unit.test.ts
index 75d775c235..cf59f3ab84 100644
--- a/apps/cli/src/commands/config/push/push.encoders.unit.test.ts
+++ b/apps/cli/src/commands/config/push/push.encoders.unit.test.ts
@@ -504,6 +504,13 @@ describe("encodeAuthBody", () => {
     expect(result.body).toEqual({ mailer_autoconfirm: false });
   });
 
+  it("inverts sms.enable_confirmations into sms_autoconfirm", () => {
+    const result = encodeAuthBody(
+      authInput({ changes: [change(["auth", "sms", "enable_confirmations"], true)] }),
+    );
+    expect(result.body).toEqual({ sms_autoconfirm: false });
+  });
+
   it("maps password_requirements through the character-class table", () => {
     const result = encodeAuthBody(
       authInput({ changes: [change(["auth", "password_requirements"], "letters_digits")] }),
diff --git a/apps/cli/tests/helpers/config-fixtures.ts b/apps/cli/tests/helpers/config-fixtures.ts
index a9b22abffa..b8605c097d 100644
--- a/apps/cli/tests/helpers/config-fixtures.ts
+++ b/apps/cli/tests/helpers/config-fixtures.ts
@@ -96,7 +96,7 @@ export function v2ProjectConfigResponse(
       sms_messagebird_originator: null,
       sms_textlocal_sender: null,
       sms_vonage_from: null,
-      sms_autoconfirm: false,
+      sms_autoconfirm: true,
       sms_max_frequency: 5,
       sms_otp_exp: 60,
       sms_otp_length: 6,
diff --git a/packages/config/src/project-config/project-config.unit.test.ts b/packages/config/src/project-config/project-config.unit.test.ts
index 6032b555dd..dbb83d8d6f 100644
--- a/packages/config/src/project-config/project-config.unit.test.ts
+++ b/packages/config/src/project-config/project-config.unit.test.ts
@@ -1018,10 +1018,9 @@ describe("fromApiProjectConfig — auth section", () => {
     expect(result.auth?.email?.enable_confirmations).toBe(false);
   });
 
-  test("sms_autoconfirm maps to auth.sms.enable_confirmations WITHOUT inverting", () => {
-    // Unlike mailer_autoconfirm/email.enable_confirmations, this key isn't inverted.
+  test("sms_autoconfirm inverts to auth.sms.enable_confirmations", () => {
     const result = fromApiProjectConfig({ auth: { sms_autoconfirm: true } });
-    expect(result.auth?.sms?.enable_confirmations).toBe(true);
+    expect(result.auth?.sms?.enable_confirmations).toBe(false);
   });
 
   test("rate_limit_otp renames to auth.rate_limit.sign_in_sign_ups", () => {
diff --git a/packages/config/src/project-config/registry-auth.ts b/packages/config/src/project-config/registry-auth.ts
index e67a7e7484..8d6af692a4 100644
--- a/packages/config/src/project-config/registry-auth.ts
+++ b/packages/config/src/project-config/registry-auth.ts
@@ -782,8 +782,7 @@ const web3Rows: ReadonlyArray<ProjectConfigMappingRow> = [
 
 const smsBaseRows: ReadonlyArray<ProjectConfigMappingRow> = [
   boolRow(["auth", "sms", "enable_signup"], "external_phone_enabled"),
-  // Not inverted, unlike mailer_autoconfirm: sms_autoconfirm maps to enable_confirmations directly.
-  boolRow(["auth", "sms", "enable_confirmations"], "sms_autoconfirm"),
+  invertedBoolRow(["auth", "sms", "enable_confirmations"], "sms_autoconfirm"),
   stringRow(["auth", "sms", "template"], "sms_template"),
   secondsDurationRow(["auth", "sms", "max_frequency"], "sms_max_frequency"),
   uintRow(["auth", "sms", "otp_length"], "sms_otp_length"),