diff --git a/specification/storage/Microsoft.BlobStorage/models.tsp b/specification/storage/Microsoft.BlobStorage/models.tsp
index efb3b576096a..00595d564897 100644
--- a/specification/storage/Microsoft.BlobStorage/models.tsp
+++ b/specification/storage/Microsoft.BlobStorage/models.tsp
@@ -341,6 +341,11 @@ model KeyInfo {
 
   /** The date-time the key expires. */
   @Xml.name("Expiry") expiry: string;
+
+  /** The delegated user tenant id in Azure AD. */
+  @Xml.name("DelegatedUserTid")
+  @added(Versions.v2026_04_06)
+  delegatedUserTid?: uuid;
 }
 
 /** A user delegation key. */
@@ -363,6 +368,11 @@ model UserDelegationKey {
   /** The service version that created the key. */
   @Xml.name("SignedVersion") signedVersion: string;
 
+  /** The delegated user tenant id in Azure AD. Return if DelegatedUserTid is specified. */
+  @Xml.name("SignedDelegatedUserTid")
+  @added(Versions.v2026_04_06)
+  signedDelegatedUserTid?: uuid;
+
   /** The key as a base64 string. */
   @Xml.name("Value")
   value: base64Bytes;
diff --git a/specification/storage/data-plane/Microsoft.BlobStorage/stable/2026-04-06/generated_blob.json b/specification/storage/data-plane/Microsoft.BlobStorage/stable/2026-04-06/generated_blob.json
index ab86ac44e4aa..ee63bc1130d2 100644
--- a/specification/storage/data-plane/Microsoft.BlobStorage/stable/2026-04-06/generated_blob.json
+++ b/specification/storage/data-plane/Microsoft.BlobStorage/stable/2026-04-06/generated_blob.json
@@ -17223,6 +17223,11 @@
           "type": "string",
           "description": "The date-time the key expires.",
           "x-ms-client-name": "expiry"
+        },
+        "DelegatedUserTid": {
+          "$ref": "#/definitions/Azure.Core.uuid",
+          "description": "The delegated user tenant id in Azure AD.",
+          "x-ms-client-name": "delegatedUserTid"
         }
       },
       "required": [
@@ -18267,6 +18272,11 @@
           "description": "The service version that created the key.",
           "x-ms-client-name": "signedVersion"
         },
+        "SignedDelegatedUserTid": {
+          "$ref": "#/definitions/Azure.Core.uuid",
+          "description": "The delegated user tenant id in Azure AD. Return if DelegatedUserTid is specified.",
+          "x-ms-client-name": "signedDelegatedUserTid"
+        },
         "Value": {
           "$ref": "#/definitions/base64Bytes",
           "description": "The key as a base64 string.",