diff --git a/specification/storage/data-plane/Microsoft.FileStorage/stable/2026-02-06/file.json b/specification/storage/data-plane/Microsoft.FileStorage/stable/2026-02-06/file.json
index c0e89778f544..6079d5d4e49d 100644
--- a/specification/storage/data-plane/Microsoft.FileStorage/stable/2026-02-06/file.json
+++ b/specification/storage/data-plane/Microsoft.FileStorage/stable/2026-02-06/file.json
@@ -239,6 +239,93 @@
         }
       ]
     },
+    "/?restype=service&comp=userdelegationkey": {
+      "post": {
+        "tags": [
+          "service"
+        ],
+        "operationId": "Service_GetUserDelegationKey",
+        "description": "Retrieves a user delegation key for the File service. This is only a valid operation when using bearer token authentication.",
+        "parameters": [
+          {
+            "$ref": "#/parameters/KeyInfo"
+          },
+          {
+            "$ref": "#/parameters/Timeout"
+          },
+          {
+            "$ref": "#/parameters/ApiVersionParameter"
+          },
+          {
+            "$ref": "#/parameters/ClientRequestId"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Success.",
+            "headers": {
+              "x-ms-client-request-id": {
+                "x-ms-client-name": "ClientRequestId",
+                "type": "string",
+                "description": "If a client request id header is sent in the request, this header will be present in the response with the same value."
+              },
+              "x-ms-request-id": {
+                "x-ms-client-name": "RequestId",
+                "type": "string",
+                "description": "This header uniquely identifies the request that was made and can be used for troubleshooting the request."
+              },
+              "x-ms-version": {
+                "x-ms-client-name": "Version",
+                "type": "string",
+                "description": "Indicates the version of the Blob service used to execute the request. This header is returned for requests made against version 2009-09-19 and above."
+              },
+              "Date": {
+                "type": "string",
+                "format": "date-time-rfc1123",
+                "description": "UTC date/time value generated by the service that indicates the time at which the response was initiated"
+              }
+            },
+            "schema": {
+              "$ref": "#/definitions/UserDelegationKey"
+            }
+          },
+          "default": {
+            "description": "Failure",
+            "headers": {
+              "x-ms-error-code": {
+                "x-ms-client-name": "ErrorCode",
+                "type": "string"
+              }
+            },
+            "schema": {
+              "$ref": "#/definitions/StorageError"
+            }
+          }
+        }
+      },
+      "parameters": [
+        {
+          "name": "restype",
+          "description": "restype",
+          "in": "query",
+          "required": true,
+          "type": "string",
+          "enum": [
+            "service"
+          ]
+        },
+        {
+          "name": "comp",
+          "description": "comp",
+          "in": "query",
+          "required": true,
+          "type": "string",
+          "enum": [
+            "userdelegationkey"
+          ]
+        }
+      ]
+    },
     "/{shareName}?restype=share": {
       "put": {
         "tags": [
@@ -7674,6 +7761,68 @@
         "name": "ShareRootSquash",
         "modelAsString": false
       }
+    },
+    "KeyInfo": {
+      "type": "object",
+      "required": [
+        "Expiry"
+      ],
+      "description": "Key information",
+      "properties": {
+        "Start": {
+          "description": "The date-time the key is active in ISO 8601 UTC time",
+          "type": "string"
+        },
+        "Expiry": {
+          "description": "The date-time the key expires in ISO 8601 UTC time",
+          "type": "string"
+        }
+      }
+    },
+    "UserDelegationKey": {
+      "type": "object",
+      "required": [
+        "SignedOid",
+        "SignedTid",
+        "SignedStart",
+        "SignedExpiry",
+        "SignedService",
+        "SignedVersion",
+        "Value"
+      ],
+      "description": "A user delegation key",
+      "properties": {
+        "SignedOid": {
+          "description": "The Azure Active Directory object ID in GUID format.",
+          "type": "string"
+        },
+        "SignedTid": {
+          "description": "The Azure Active Directory tenant ID in GUID format",
+          "type": "string"
+        },
+        "SignedStart": {
+          "description": "The date-time the key is active",
+          "type": "string",
+          "format": "date-time"
+        },
+        "SignedExpiry": {
+          "description": "The date-time the key expires",
+          "type": "string",
+          "format": "date-time"
+        },
+        "SignedService": {
+          "description": "Abbreviation of the Azure Storage service that accepts the key",
+          "type": "string"
+        },
+        "SignedVersion": {
+          "description": "The service version that created the key",
+          "type": "string"
+        },
+        "Value": {
+          "description": "The key as a base64 string",
+          "type": "string"
+        }
+      }
     }
   },
   "parameters": {
@@ -8759,6 +8908,16 @@
       "type": "string",
       "x-ms-parameter-location": "method"
     },
+    "KeyInfo": {
+      "description": "Key information",
+      "name": "KeyInfo",
+      "in": "body",
+      "x-ms-parameter-location": "method",
+      "required": true,
+      "schema": {
+        "$ref": "#/definitions/KeyInfo"
+      }
+    },
     "EnableSmbDirectoryLease": {
       "name": "x-ms-enable-smb-directory-lease",
       "x-ms-client-name": "enableSmbDirectoryLease",