How To Fix TXS_MESSAGES009 - Error acquiring OAuth2 token using client credentials

TXS_MESSAGES009 - Overview

• Message type: E = Error

• Message class: TXS_MESSAGES - Tax Service Messages class

• Message number: 009

• Message text: Error acquiring OAuth2 token using client credentials

What causes this issue?

The following are the possible causes for this error.
The host for the <LS>Tax Service </>application is not configured to
support bearer tokens.
The <LS>Token Lifetime </>field in the <LS>SAP Cloud Platform Cockpit
</>is empty.
The host or endpoint for your <LS>Communication System </>has invalid
information.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Contact your system administrator.

Procedure for System Administrators

To solve the issues described in the Diagnosis field, follow the
instructions described below.
In the <LS>SAP Cloud Platform Cockpit</>, under <LS>Security</> >
<LS>OAuth</>, under the <LS>Clients </>tab, set the configuration for
the <LS>Authorization Grant</> field as <LB>Authorization Code</>.
In the <LS>SAP Cloud Platform Cockpit</>, under <LS>Security </>><LS>
OAuth</><(>,<)><LS> </>under<LS> </>the<LS> Clients </>tab, choose your
client and configure the <LS>Token Lifetime </>field with a value that
is anything different from zero.
In the <LS>SAP Fiori Launchpad</>, check the configurations for
<LS>Communication Systems</>.

Error message extract from SAP system. Copyright SAP SE.

TXS_MESSAGES009 - Details

• The SAP error message TXS_MESSAGES009 indicates an issue with acquiring an OAuth2 token using client credentials. This error typically arises in scenarios where an application is trying to authenticate with an SAP system using OAuth2, but the process fails for some reason. Below are the potential causes, solutions, and related information for this error:
  Causes
  
  
  Invalid Client Credentials: The client ID or client secret provided in the request may be incorrect or not properly configured in the SAP system.
  
  
  Incorrect Token Endpoint: The URL used to request the OAuth2 token may be incorrect or not accessible.
  
  
  Scope Issues: The requested scopes may not be valid or may not be granted to the client application.
  
  
  
  Configuration Issues: The OAuth2 configuration in the SAP system may not be set up correctly, including the client application registration.
  
  
  Network Issues: There may be network connectivity issues preventing the application from reaching the OAuth2 token endpoint.
  
  
  Expired Credentials: The client secret may