The request sent to the external system is missing data, contains incorrect data, or is not formatted as the external system expects.
Check requestDatatype. The adapter runtime library formats the outbound request differently depending on the declared datatype. If requestDatatype does not match what the external system expects, the request may arrive in the wrong format. See Changing data types for the supported options.
Check the request schema. The request schema defines how data is translated before being sent. If data is missing from the request or placed in an unexpected location, the schema translation may be misrouting it. The request schema also handles encoding and encrypting individual fields.
Review the endpoint configuration. If changes are needed, the relevant files are in /adapter-home-dir/entities/<entity-name>: action.json for call-level settings such as path, method, and data types, and the schema files for data translation.
If the logs do not identify the cause, contact the Itential Adapters Team with the log output.