Sending an IPAWS message generates the following error code:
IPAWS Error 221 - Contact Everbridge
Message format and content does not meet requirements for exchanging messages with other COGs.
Review your notification to ensure that all parts of your IPAWS message are in the correct format and valid. Contact Everbridge Support for additional assistance. For a full list of IPAWS publishing error codes and descriptions, please reference Knowledge Base Article 000003386 - IPAWS Publishing Status Values.