# Facing 401 Authentication-Errors

**URL:** <https://zatca1.discourse.group/t/facing-401-authentication-errors/10774>\
**Category:** Clearance and Reporting\
**Created:** [September 2, 2026, 12:43pm UTC](https://zatca1.discourse.group/t/facing-401-authentication-errors/10774 "2026-09-02T12:43:42Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Shzzamx](https://dub1.discourse-cdn.com/flex013/user_avatar/zatca1.discourse.group/shzzamx/32/480_2.png) [@Shzzamx](https://zatca1.discourse.group/u/Shzzamx)\
**Post date:** [September 2, 2026, 12:43pm UTC](https://zatca1.discourse.group/t/facing-401-authentication-errors/10774/1 "2026-09-02T12:43:42Z")

</div>

We are facing an **Invalid Authentication Certificate** error while reporting invoices in the **Simulation environment**.

The response we are receiving is:

{{“validationResults”:{“infoMessages”:,“warningMessages”:,“errorMessages”:[{“type”:“ERROR”,“code”:“Authentication-Errors”,“category”:“Invalid-Authentication-Certificate”,“message”:“”,“status”:“ERROR”}],“status”:“ERROR”},“clearanceStatus”:“NOT\_CLEARED”,“clearedInvoice”:null}}  
The invoice is therefore not being cleared, and the response shows `clearanceStatus: NOT_CLEARED`.

Could you please check and advise us on the required action to resolve this issue?  
@idaoud @Ankit.K.Tiwari

Thank you.