unable to log in in sharepoint designer2013

If you're facing login issues with SharePoint Designer 2013 when connecting to SharePoint Online, this could be due to a number of factors, including authentication changes made by Microsoft for modern SharePoint Online sites. Here's how to troubleshoot and potentially resolve this issue:

1. Ensure Modern Authentication is Enabled

SharePoint Online uses modern authentication by default, and SharePoint Designer 2013 might not be fully compatible with modern authentication without updates. Make sure you are using the latest version of SharePoint Designer 2013.

Steps:

• Open SharePoint Designer.
• Go to File > Account > Update Options.
• Click Update Now to make sure you have the latest updates installed.

2. Use App Password if Multi-Factor Authentication (MFA) is Enabled

If your organization has enabled MFA, SharePoint Designer 2013 doesn’t support MFA directly. You need to create an app password to use in place of your regular password.

Steps to create an app password:

• Go to https://account.microsoft.com/security.
• Under More security options, find App passwords and click Create a new app password.
• Use this app password to log in to SharePoint Designer.

3. Clear Cache and Credentials

Cached credentials might cause issues with the login.

Steps:

• Go to Control Panel > Credential Manager.
• Remove any cached credentials related to SharePoint or Office 365.
• Restart SharePoint Designer and try logging in again.

4. Disable Internet Explorer Enhanced Security Configuration (ESC)

SharePoint Designer relies on Internet Explorer settings. Internet Explorer’s Enhanced Security Configuration might block proper authentication.

Steps:

• Open Server Manager on your Windows machine.
• Go to Local Server and find IE Enhanced Security Configuration.
• Turn it off for administrators and try again.

5. Use Internet Explorer Compatibility Settings

SharePoint Designer uses Internet Explorer for some authentication tasks. Sometimes enabling compatibility settings helps.

Steps:

• Open Internet Explorer.
• Go to Tools > Internet Options > Security > Trusted Sites.
• Add your SharePoint Online URL to the list of trusted sites.

6. Check SharePoint Online Settings

Ensure that the SharePoint Online site is configured to allow SharePoint Designer access.

Steps:

• Go to SharePoint Admin Center.
• In the settings, check if Allow SharePoint Designer to be used is enabled.

7. Check for Modern Authentication Issues

If SharePoint Online uses only modern authentication and SharePoint Designer 2013 is not able to authenticate, you might need to consider upgrading to a more modern tool, such as Power Automate or PowerApps, which are fully supported for SharePoint Online.

Try these steps, and let me know if you're able to resolve the issue or if you need further assistance!