B2C Tenant Login issue

Hi @DatNC , unfortunately, Azure AD B2C doesn't provide a built-in policy configuration to automatically clear cookies when this happens. But there are several strategies you can try to mitigate this issue.

• Instead of relying on users to access the old login page directly, you can make sure that they always navigate through your project’s Home Page. You can implement a mechanism that checks if the user is accessing the login page directly and then redirects them to the Home Page to initiate the login process correctly.
• You can create a custom page to handle errors related to authentication. This custom page can detect specific error codes and then perform actions such as clearing cookies and redirecting users to the Home Page.
• Consider reducing the lifetime of your tokens so that they expire more quickly. This won't directly solve the problem but may reduce the likelihood of running into expired tokens.
• You can inject JavaScript to clear specific cookies when certain error conditions are detected.

Here is a sample JavaScript snippet:

<script>
  function clearCookies() {
    document.cookie.split(";").forEach(function(c) { 
      document.cookie = c.replace(/^ +/, "").replace(/=.*/, "=;expires=" + new Date().toUTCString() + ";path=/"); 
    });
  }

  // Call this function based on your specific error detection logic
  clearCookies();
</script>

If you decide to implement custom error handling or JavaScript injection, you’ll need to update your B2C custom policies. For example:

<TrustFrameworkPolicy ...>
  <BuildingBlocks>
    <ContentDefinitions>
      <ContentDefinition Id="api.error">
        <LoadUri>https://your-custom-error-page-url</LoadUri>
        <RecoveryUri>...</RecoveryUri>
      </ContentDefinition>
    </ContentDefinitions>
  </BuildingBlocks>
</TrustFrameworkPolicy>

In the LoadUri, you can point to a custom HTML page where you include the JavaScript to clear cookies.

Please let me know if you have any questions and I can help you further.

If this answer helps you please mark "Accept Answer" so other users can reference it.

Thank you,

James