3172655 - How to Resolve the Error: Invalid or Unrecognized Sender Credentials

A Purchase Order (PO) or invoice failed to send to the SAP Business Network (BN) and returned the following error message: 

"Invalid or unrecognized sender credentials"?

Response returned with status Code [401] of Type [Unauthorized] with message {Error:Invalid or unrecognized sender credentials. Please contact support with the Error Reference Number: ANERR-xxxxxxxxxxxxxxxxxxx for more details}.

SAP Ariba Guided Buying
SAP Ariba Business Network

Shared Secret, Invalid or Unrecognized Sender Credentials, 401 Unauthorized, Authentication Error, SAP Business Network, BN Connectivity, PO Transmission Failure, Invoice Transmission Failure, Sender Authentication , KBA , migration source: knowledge@ariba , 12s2 ea , migrated on: 2022-04-02 14:15:51 , BNS-ARI-INV , Invoicing , BNS-ARI-PUR , Purchasing , BNS-ARI-PUR-SRV , Services Procurement , How To