diff --git a/docs/v3/openapi.json b/docs/v3/openapi.json
index 9f6229c44..e4975d47f 100644
--- a/docs/v3/openapi.json
+++ b/docs/v3/openapi.json
@@ -6409,7 +6409,7 @@
             "patch": {
                 "summary": "Add a system to a template",
                 "description": "Add a system authenticated by  its client identity certificate to a template",
-                "operationId": "addTemplateSystem",
+                "operationId": "addTemplateSubscribedSystem",
                 "parameters": [
                     {
                         "name": "template_id",
@@ -6421,17 +6421,6 @@
                         }
                     }
                 ],
-                "requestBody": {
-                    "description": "Request body",
-                    "content": {
-                        "application/json": {
-                            "schema": {
-                                "$ref": "#/components/schemas/controllers.TemplateSystemsUpdateRequest"
-                            }
-                        }
-                    },
-                    "required": true
-                },
                 "responses": {
                     "200": {
                         "description": "OK",
@@ -6472,8 +6461,7 @@
                     {
                         "RhIdentity": []
                     }
-                ],
-                "x-codegen-request-body-name": "body"
+                ]
             }
         },
         "/templates/{template_id}/systems": {
diff --git a/manager/controllers/template_subscribed_systems_update.go b/manager/controllers/template_subscribed_systems_update.go
index 8ae418863..71feadaed 100644
--- a/manager/controllers/template_subscribed_systems_update.go
+++ b/manager/controllers/template_subscribed_systems_update.go
@@ -14,11 +14,10 @@ import (
 
 // @Summary Add a system to a template
 // @Description Add a system authenticated by  its client identity certificate to a template
-// @ID addTemplateSystem
+// @ID addTemplateSubscribedSystem
 // @Security RhIdentity
 // @Accept   json
 // @Produce  json
-// @Param    body    body   TemplateSystemsUpdateRequest true "Request body"
 // @Param    template_id    path  string   true  "Template ID"
 // @Success 200
 // @Failure 400 {object} 	utils.ErrorResponse
diff --git a/manager/middlewares/authentication.go b/manager/middlewares/authentication.go
index f0f30447a..a7d262807 100644
--- a/manager/middlewares/authentication.go
+++ b/manager/middlewares/authentication.go
@@ -134,7 +134,7 @@ func SystemCertAuthenticator() gin.HandlerFunc {
 			slices.Contains(validSystemCertTypes, xrhid.Identity.System.CertType) &&
 			findAccount(c, xrhid.Identity.OrgID)) {
 			c.AbortWithStatusJSON(http.StatusUnauthorized,
-				utils.ErrorResponse{Error: "Invalid x-rh-identity system header"})
+				utils.ErrorResponse{Error: "Invalid system identity header"})
 			return
 		}
 		c.Set(utils.KeySystem, xrhid.Identity.System.CommonName)