diff --git a/platform/etc/platform.docker.yaml b/platform/etc/platform.docker.yaml
index a07cb68..a24f1af 100644
--- a/platform/etc/platform.docker.yaml
+++ b/platform/etc/platform.docker.yaml
@@ -20,7 +20,8 @@ Auth:
   RequirePhoneBound: false
 
 SMS:
-  Provider: off
+  # 须加引号：YAML 1.1 会把裸 off/on 当成布尔，导致 type mismatch for field sms.provider
+  Provider: "off"
   CodeTTLSeconds: 300
   ResendSeconds: 60
   # 试运行关绑定短信；正式接短信后 Provider=dev|真实厂商 且 RequireForBind=true
diff --git a/platform/etc/platform.yaml b/platform/etc/platform.yaml
index 3dd0517..73ec97d 100644
--- a/platform/etc/platform.yaml
+++ b/platform/etc/platform.yaml
@@ -19,11 +19,12 @@ Auth:
   RequirePhoneBound: false
 
 SMS:
-  Provider: off
+  # 须加引号：YAML 1.1 会把裸 off/on 当成布尔，导致 type mismatch for field sms.provider
+  Provider: "off"
   CodeTTLSeconds: 300   # 短信验证码有效期（秒）
   ResendSeconds: 60
   # DevFixedCode: "123456"
-  # 试运行未接短信平台：false；正式接入后改为 true，且 Provider 勿用 off
+  # 试运行未接短信平台：false；正式接入后改为 true，且 Provider 勿用 "off"
   RequireForBind: false
 
 # 外公司部署：每次续费/延期生成独立签名文件（目录非固定单文件）