Revise workflow retirement information in documentation

Updated the retirement date for SharePoint 2013 workflows and modified caution to important.

Author: Cloud-Writer

SharePoint/SharePointOnline/workflows/nintex-workflow-fails-to-start.md

@@ -15,13 +15,13 @@ ms.custom:
   - CI 146979
 appliesto: 
   - SharePoint Online
-ms.date: 12/17/2023
+ms.date: 12/02/2025
 ---
 
 # Nintex workflow on SharePoint Online doesn't start
 
-> [!CAUTION]
-> SharePoint 2013 workflows are scheduled for retirement in April 2024. For more information, see: [SharePoint 2013 workflow retirement](https://support.microsoft.com/office/sharepoint-2013-workflow-retirement-4613d9cf-69aa-40f7-b6bf-6e7831c9691e).
+> [!IMPORTANT]
+> SharePoint 2013 workflow has been turned off on all newly created tenants since April 2, 2024. It will be removed from all existing tenants on April 2, 2026. See [SharePoint 2013 workflow retirement](https://support.microsoft.com/office/sharepoint-2013-workflow-retirement-4613d9cf-69aa-40f7-b6bf-6e7831c9691e) for more information.
 
 ## Symptoms