Drupal

When integrating Drupal with Azure AD B2C using the miniOrange OAuth Client module, you may encounter a “Redirect URI mismatch” error. This typically occurs when the URI sent from Drupal does not match the URI registered in Entra ID / Azure AD B2C.

Symptoms:

• Users cannot log in via EntraID / Azure AD B2C.
• Error message: “The redirect URI does not match the registered URI for this application.”
• The module may still reference a development or old site URL.

Step 1: Verify Callback/Redirect URI in Drupal

1. Navigate to your Drupal site:
   Drupal Admin → miniOrange OAuth Client Module → Configure OAuth tab
   
2. Locate the Callback/Redirect URI field.
   
3. Copy the URI for use in Azure AD B2C.

Step 3: Clear Drupal Cache

After updating Azure AD B2C:

1. Clear the Drupal cache to apply the new settings.
   
   • Configuration → Performance → Clear all caches
     
2. Test the OAuth login flow again.
   

Step 4: Troubleshooting & Best Practices

• Ensure the URI in Drupal exactly matches the Azure AD B2C entry.
  
• Avoid extra spaces, trailing slashes, or mismatched case.
  
• If using multiple environments (dev, staging, prod), register all necessary URIs in Entra ID / Azure AD B2C
  
• Clear browser cache or try using an incognito window if issues persist.