diff --git a/api/controllers/console/workspace/account.py b/api/controllers/console/workspace/account.py
index ccfb50c214..d02e22154f 100644
--- a/api/controllers/console/workspace/account.py
+++ b/api/controllers/console/workspace/account.py
@@ -133,7 +133,6 @@ class EducationAutocompleteQuery(BaseModel):
 class ChangeEmailSendPayload(BaseModel):
     email: EmailStr
     language: str | None = None
-    phase: str | None = None
     token: str | None = None
 
 
@@ -548,10 +547,8 @@ class ChangeEmailSendEmailApi(Resource):
         user_email = None
         email_for_sending = args.email.lower()
         send_phase = AccountService.CHANGE_EMAIL_PHASE_OLD
-        if args.phase is not None and args.phase == AccountService.CHANGE_EMAIL_PHASE_NEW:
+        if args.token is not None:
             send_phase = AccountService.CHANGE_EMAIL_PHASE_NEW
-            if args.token is None:
-                raise InvalidTokenError()
 
             reset_data = AccountService.get_change_email_data(args.token)
             if reset_data is None:
diff --git a/api/tests/unit_tests/controllers/console/test_workspace_account.py b/api/tests/unit_tests/controllers/console/test_workspace_account.py
index f4aa0404a9..448326e2cb 100644
--- a/api/tests/unit_tests/controllers/console/test_workspace_account.py
+++ b/api/tests/unit_tests/controllers/console/test_workspace_account.py
@@ -53,7 +53,7 @@ class TestChangeEmailSend:
     @patch("controllers.console.workspace.account.extract_remote_ip", return_value="127.0.0.1")
     @patch("libs.login.check_csrf_token", return_value=None)
     @patch("controllers.console.wraps.FeatureService.get_system_features")
-    def test_should_normalize_new_email_phase(
+    def test_should_infer_new_email_phase_from_token(
         self,
         mock_features,
         mock_csrf,
@@ -78,7 +78,7 @@ class TestChangeEmailSend:
         with app.test_request_context(
             "/account/change-email",
             method="POST",
-            json={"email": "New@Example.com", "language": "en-US", "phase": "new_email", "token": "token-123"},
+            json={"email": "New@Example.com", "language": "en-US", "token": "token-123"},
         ):
             _set_logged_in_user(_build_account("tester@example.com", "tester"))
             response = ChangeEmailSendEmailApi().post()
@@ -105,7 +105,7 @@ class TestChangeEmailSend:
     @patch("controllers.console.workspace.account.extract_remote_ip", return_value="127.0.0.1")
     @patch("libs.login.check_csrf_token", return_value=None)
     @patch("controllers.console.wraps.FeatureService.get_system_features")
-    def test_should_force_old_email_phase_for_legacy_or_unexpected_phase_input(
+    def test_should_ignore_client_phase_and_use_old_phase_when_token_missing(
         self,
         mock_features,
         mock_csrf,
@@ -135,7 +135,7 @@ class TestChangeEmailSend:
         with app.test_request_context(
             "/account/change-email",
             method="POST",
-            json={"email": "old@example.com", "language": "en-US", "phase": "old_email_verified"},
+            json={"email": "old@example.com", "language": "en-US", "phase": "new_email"},
         ):
             _set_logged_in_user(_build_account("tester@example.com", "tester"))
             response = ChangeEmailSendEmailApi().post()
@@ -185,7 +185,7 @@ class TestChangeEmailSend:
         with app.test_request_context(
             "/account/change-email",
             method="POST",
-            json={"email": "New@Example.com", "language": "en-US", "phase": "new_email", "token": "token-123"},
+            json={"email": "New@Example.com", "language": "en-US", "token": "token-123"},
         ):
             _set_logged_in_user(_build_account("tester@example.com", "tester"))
             with pytest.raises(InvalidTokenError):
diff --git a/web/app/account/(commonLayout)/account-page/email-change-modal.tsx b/web/app/account/(commonLayout)/account-page/email-change-modal.tsx
index 87ca6a689c..19bcc2716e 100644
--- a/web/app/account/(commonLayout)/account-page/email-change-modal.tsx
+++ b/web/app/account/(commonLayout)/account-page/email-change-modal.tsx
@@ -58,11 +58,10 @@ const EmailChangeModal = ({ onClose, email, show }: Props) => {
     }, 1000)
   }
 
-  const sendEmail = async (email: string, isOrigin: boolean, token?: string) => {
+  const sendEmail = async (email: string, token?: string) => {
     try {
       const res = await sendVerifyCode({
         email,
-        phase: isOrigin ? 'old_email' : 'new_email',
         token,
       })
       startCount()
@@ -106,7 +105,6 @@ const EmailChangeModal = ({ onClose, email, show }: Props) => {
   const sendCodeToOriginEmail = async () => {
     await sendEmail(
       email,
-      true,
     )
     setStep(STEP.verifyOrigin)
   }
@@ -162,7 +160,6 @@ const EmailChangeModal = ({ onClose, email, show }: Props) => {
     }
     await sendEmail(
       mail,
-      false,
       stepToken,
     )
     setStep(STEP.verifyNew)
diff --git a/web/service/common.ts b/web/service/common.ts
index 3d9c05e75b..6b35954617 100644
--- a/web/service/common.ts
+++ b/web/service/common.ts
@@ -372,7 +372,7 @@ export const submitDeleteAccountFeedback = (body: { feedback: string, email: str
 export const getDocDownloadUrl = (doc_name: string): Promise<{ url: string }> =>
   get<{ url: string }>('/compliance/download', { params: { doc_name } }, { silent: true })
 
-export const sendVerifyCode = (body: { email: string, phase: string, token?: string }): Promise<CommonResponse & { data: string }> =>
+export const sendVerifyCode = (body: { email: string, token?: string }): Promise<CommonResponse & { data: string }> =>
   post<CommonResponse & { data: string }>('/account/change-email', { body })
 
 export const verifyEmail = (body: { email: string, code: string, token: string }): Promise<CommonResponse & { is_valid: boolean, email: string, token: string }> =>