3721106 - Error: "HTTP 401 Unauthorized Error" When Sending Messages from Network to External System

Error: "HTTP operation failed invoking https://xxx-xxx.xxxxxxxxx.xxxx/xxxxxxx 401 Unauthorized Error" When Sending Messages from Network to External System

authentication error, external system integration, HTTP 401 Unauthorized, invalid credentials, API key issue, OAuth authentication failure, Basic authentication error, network communication failure, external system error, integration troubleshooting, SAP authentication issue, subscription key validation, external API error, authentication configuration, system communication error , KBA , SBN-LBN-INT , Integration , Known Error