How To Fix CLB652 - Unable to retrieve access token

SAP Error Message - Details

• Message type: E = Error

• Message class: CLB - 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 has to be used. If none is
available for the current user<(>,<)> a new token is requested from the
service provider. This request failed and did not return an access
token.

System Response

The function cannot be executed.

How to fix this error?

One reason might be that the service provider is offline for a short
period or some other connection problem. Try again later.

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 this system using the
certificate from an SSF application named CLBOAU
When using a SAML assertion to authenticate<(>,<)> the user the SAML
provider has to be enabled on this system
The IDP named in the SAML2 transaction 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 CLB652 - Unable to retrieve access token ?

  The SAP error message CLB652: 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 that requires an OAuth token.
  Causes:
  
  Invalid Credentials: The credentials (client ID, client secret) used to request the access token may be incorrect.
  Expired Token: If a refresh token is being used, it may have expired.
  Network Issues: There may be connectivity issues preventing the application from reaching the token service.
  Configuration Issues: The OAuth configuration in the SAP system may not be set up correctly, such as incorrect redirect URIs or scopes.
  Service Unavailability: The service that provides the access token may be down or experiencing issues.
  Authorization Issues: The user or application may not have the necessary permissions to request an access token.
  
  Solutions:
  
  Check Credentials: Verify that the client ID and client secret are correct and have not been changed or revoked.
  Token Expiry: If using a refresh token, ensure it is still valid. If not, re-authenticate to obtain a new access token.
  Network Connectivity: Check your network connection and ensure that the service endpoint for token retrieval is reachable.
  Review Configuration: Go through the OAuth configuration settings in the SAP system to ensure they are correct. This includes checking redirect URIs, scopes, and any other relevant settings.
  Service Status: Check the status of the token service to ensure it is operational. You may need to consult SAP support or your system administrator if there are ongoing issues.
  Permissions: Ensure that the user or application has the necessary permissions to access the service and request an access token.
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for OAuth and authentication mechanisms for specific details on configuration and troubleshooting.
  SAP Community: Engage with the SAP Community forums to see if others have encountered similar issues and what solutions they found effective.
  Logs and Traces: Check the application logs and traces for more detailed error messages that can provide additional context for the failure.
  SAP 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 CLB652 error effectively.