Apollo added structured error_details to selected REST and MCP errors, with stable codes and recovery guidance covering search validation and enrichment failures. Organization Enrichment requests with a missing or unreadable identifier now return HTTP 422 where they used to return 200 with an empty organization. The legacy top level fields on migrated errors will be removed on 16 February 2027.
The 200 that becomes a 422 is the line to read. Any workflow that treated an empty enrichment as a quiet success will now see a failure, which is the honest answer and also a breaking one. The February 2027 removal date gives integration owners five months to update their error handling.