diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index eb79f8f..05c9be3 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -4,10 +4,10 @@
     <option name="autoReloadType" value="ALL" />
   </component>
   <component name="ChangeListManager">
-    <list default="true" id="3fefb2c4-b6f9-466b-a523-53352e8d6f95" name="更改" comment=":recycle: Improve notifications mark read system">
+    <list default="true" id="3fefb2c4-b6f9-466b-a523-53352e8d6f95" name="更改" comment=":bug: Bug fixes on multi-factors based authentication">
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/pkg/internal/models/auth.go" beforeDir="false" afterPath="$PROJECT_DIR$/pkg/internal/models/auth.go" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/pkg/internal/services/ticket.go" beforeDir="false" afterPath="$PROJECT_DIR$/pkg/internal/services/ticket.go" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/pkg/internal/server/api/preferences_api.go" beforeDir="false" afterPath="$PROJECT_DIR$/pkg/internal/server/api/preferences_api.go" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -154,7 +154,6 @@
     </option>
   </component>
   <component name="VcsManagerConfiguration">
-    <MESSAGE value=":bug: Fix compare perm node panic" />
     <MESSAGE value=":bug: Fix compare perm node function" />
     <MESSAGE value=":sparkles: Bot related bot key apis" />
     <MESSAGE value=":bug: Fix bot related bot key apis path error" />
@@ -179,7 +178,8 @@
     <MESSAGE value=":bug: Trying to prevent send same notification to the same user in batch" />
     <MESSAGE value=":sparkles: Allow user view and remove notification subscriptions" />
     <MESSAGE value=":recycle: Improve notifications mark read system" />
-    <option name="LAST_COMMIT_MESSAGE" value=":recycle: Improve notifications mark read system" />
+    <MESSAGE value=":bug: Bug fixes on multi-factors based authentication" />
+    <option name="LAST_COMMIT_MESSAGE" value=":bug: Bug fixes on multi-factors based authentication" />
   </component>
   <component name="VgoProject">
     <settings-migrated>true</settings-migrated>
diff --git a/pkg/internal/models/auth.go b/pkg/internal/models/auth.go
index c481eb4..898eeac 100644
--- a/pkg/internal/models/auth.go
+++ b/pkg/internal/models/auth.go
@@ -8,7 +8,7 @@ import (
 )
 
 type AuthConfig struct {
-	MaximumAuthSteps int `json:"maximum_auth_steps"`
+	MaximumAuthSteps int `json:"maximum_auth_steps" validate:"required,min=1,max=99"`
 }
 
 type AuthFactorType = int8
diff --git a/pkg/internal/server/api/preferences_api.go b/pkg/internal/server/api/preferences_api.go
index 2d0164b..46b62db 100644
--- a/pkg/internal/server/api/preferences_api.go
+++ b/pkg/internal/server/api/preferences_api.go
@@ -18,7 +18,7 @@ func getAuthPreference(c *fiber.Ctx) error {
 		return fiber.NewError(fiber.StatusNotFound, err.Error())
 	}
 
-	return c.JSON(cfg.Config)
+	return c.JSON(cfg.Config.Data())
 }
 
 func updateAuthPreference(c *fiber.Ctx) error {
@@ -37,7 +37,7 @@ func updateAuthPreference(c *fiber.Ctx) error {
 		return fiber.NewError(fiber.StatusBadRequest, err.Error())
 	}
 
-	return c.JSON(cfg.Config)
+	return c.JSON(cfg.Config.Data())
 }
 
 func getNotificationPreference(c *fiber.Ctx) error {