This guide provides descriptions of common authentication errors, possible causes, and troubleshooting steps to resolve them.

Token creation errors

Token creation errors happen when there are issues obtaining a new access token from the Create an access token endpoint.

HTTP status code	Error	Common causes	Troubleshooting tips
`400 Bad Request`	`"error": "invalid_request"`	A required parameter is missing or an unsupported or duplicate parameter is included.	Ensure your request payload is correctly formatted, includes only the required properties, and that all properties are of the correct data type according to the API specifications.
`400 Bad Request`	`"error": "unsupported_grant_type"`	An unrecognized grant type is requested.	Ensure that the `grant_type` is set to `client_credentials`.
`401 Unauthorized`	`"error": "invalid_client"`	The `client_id` or `client_secret` provided are incorrect or invalid.	Ensure your `client_id` and `client_secret` are correct and active.

Authentication errors

Authentication errors relate to issues with verifying credentials or tokens.

HTTP status code	Error	Common causes	Troubleshooting tips
`401 Unauthorized`	`"error": "invalid_token"`	The access token is either missing, invalid, has expired, or has been revoked.	Ensure that you are including a valid access token in the `Authorization` header and that the token has not expired.