# OAuth FAQ
# 403 Forbidden Error
What's Happening:
You're seeing a 403 Forbidden error when trying to activate your license.

Troubleshooting Tips:
- Check Your Redirect URL’s: - Make sure the redirect_uriyou include in your request is exactly the same as the OAuth Redirect URL you set up in your AppSumo Partner Portal (opens new window). Both URLs must match perfectly for OAuth to be successful.
 
- Make sure the 
- OAuth Code Usage - One-Time Use: The OAuth codecan only be used once and will expire after it's been used, either successful or through error.
- New Code Issuance: A new codewill be generated each time you authorize through OAuth.
- Re-attempt Activation: To get a new code, simply re-attempt the license activation process.
 
- One-Time Use: The OAuth 
- Re-validate Your OAuth Keys - Double-Check Your Keys: Ensure that your client_idandclient_secretkeys are correct. You can find both keys in your AppSumo Partner Portal (opens new window).
 
- Double-Check Your Keys: Ensure that your 
For detailed information, see OAuth Getting Started and OAuth Connect to AppSumo