How To Fix CLB2652 - Unable to retrieve access token

SAP Error Message - Details

• Message type: E = Error

• Message class: CLB2 - SAIL: Common messages

• Message number: 652

• Message text: Unable to retrieve access token

What causes this issue?

When using three-legged OAuth, an access token must be used. If none is
available for the current user, a new token is requested from the
service provider. Such a request has currently failed, and an access
token has not been returned.

System Response

The function cannot be executed.

How to fix this error?

Try again later - the service provider might be offline or other
connection problems might be present.

Procedure for System Administrators

Check if the credentials for three-legged OAuth authentication are met:
An OAuth client has to be registered with the service provider.
This client must have a trusted relationship to the external service
provider using the certificate from the SSF application as stored at
<DS:TRAN.CLB2_PTYPE>view cluster CLB2VC_PTYPE</>.
When using a SAML assertion to authenticate, the users to authenticate
must have been provisioned to the service provider.
The identity provider has to be made known in the service provider
settings.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CLB2652 - Unable to retrieve access token ?

  The SAP error message CLB2652, "Unable to retrieve access token," typically occurs in the context of SAP Cloud Platform or SAP Business Technology Platform when there is an issue with authentication or authorization while trying to access a service or API that requires an access token.
  Causes:
  
  Invalid Credentials: The credentials (client ID, client secret) used to request the access token may be incorrect or expired.
  Configuration Issues: The service or application may not be properly configured to allow token retrieval. This could include incorrect URLs or missing configurations in the service instance.
  Network Issues: There may be network connectivity issues preventing the application from reaching the token service.
  Service Unavailability: The token service may be down or experiencing issues.
  Scope Issues: The requested scopes may not be valid or may not be granted to the application.
  Expired Token: If a refresh token is being used, it may have expired.
  
  Solutions:
  
  Verify Credentials: Check the client ID and client secret to ensure they are correct and have not expired.
  Check Configuration: Review the configuration settings for the service or application to ensure they are set up correctly, including the token endpoint URL.
  Network Connectivity: Ensure that there are no network issues preventing access to the token service. You can test connectivity using tools like ping or curl.
  Service Status: Check the status of the SAP service to ensure it is operational. You can refer to SAP's service status page or contact SAP support.
  Review Scopes: Ensure that the requested scopes are valid and that the application has been granted the necessary permissions.
  Token Management: If using refresh tokens, ensure that they are still valid. If they have expired, you may need to re-authenticate to obtain a new access token.
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for the specific service you are using to understand the authentication flow and requirements.
  SAP Community: Engage with the SAP Community forums to see if others have encountered similar issues and to find potential solutions.
  Logs and Traces: Check application logs and traces for more detailed error messages that can provide additional context for the issue.
  Support: If the issue persists, consider reaching out to SAP support for assistance, providing them with detailed information about the error and the context in which it occurs.
  
  By following these steps, you should be able to diagnose and resolve the CLB2652 error effectively.