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3608445 - "Client authentication failed (e.g., unknown client, no client authentication included, ...)" error after executing OA2C_GENERIC_ACCESS report

Symptom

The following error is encountered after utilizing the OA2C_GENERIC_ACCESS report to verify the OAuth2 Client Configuration as per KBA 3444844 - How to verify an OAuth2 Client configuration on AS ABAP:

Client authentication failed (e.g., unknown client, no client authentication included, ...)
unauthorized
Bad credentials 

Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental.


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Environment

  • SAP NetWeaver Application Server ABAP
  • SAP NetWeaver
  • SAP S/4HANA

Product

SAP NetWeaver Application Server for ABAP all versions ; SAP NetWeaver all versions ; SAP S/4HANA all versions

Keywords

Bad credentials, unauthorized, OAuth, OAuth Client,  OA2C_GENERIC_ACCESS, Client Secret, Basic, Form Fields, OA2C_CONFIG, Client authentication failed (e.g., unknown client, no client authentication included, ...) , KBA , BC-SEC-LGN-OA2 , OAuth 2.0 for ABAP , Problem

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