← All KRA eTIMS Error Codes
999 Official

Unknown Error

KRA catch-all error with no additional information.

Log the full request and response including all headers. Retry once. If persistent, email timsupport@kra.go.ke with the full logged payload and the resultDt timestamp so KRA can trace the server-side event.
There is no actionable information in this code. The only path forward is KRA support.