# Troubleshooting

#### Common Issues <a href="#common-issues" id="common-issues"></a>

**401 Unauthorized**

* Check that your credentials are correctly base64 encoded
* Verify your account number is correct
* Ensure the shipment mode is valid<br>

**403 Forbidden**

* Your account may not have permission for the requested resource
* Contact support if you believe this is an error<br>

**Invalid Credentials**

* Double-check the format: `publickey:privatekey`
* Ensure no extra spaces or characters
* Verify base64 encoding is correct