# Random 401 Errors on Simulation Onboarding

**URL:** <https://zatca1.discourse.group/t/random-401-errors-on-simulation-onboarding/8482>\
**Category:** Onboarding, renewal and revocation\
**Created:** [September 21, 2025, 9:10am UTC](https://zatca1.discourse.group/t/random-401-errors-on-simulation-onboarding/8482 "2025-09-21T09:10:48Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Adithya\_Raviraja](https://avatars.discourse-cdn.com/v4/letter/a/91b2a8/32.png) [@Adithya\_Raviraja](https://zatca1.discourse.group/u/Adithya_Raviraja)\
**Post date:** [September 21, 2025, 9:10am UTC](https://zatca1.discourse.group/t/random-401-errors-on-simulation-onboarding/8482/1 "2025-09-21T09:10:48Z")

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Hi ZATCA Team,

We have been randomly receiving a 401 response code from the endpoint “[https://gw-fatoora.zatca.gov.sa/e-invoicing/simulation/production/csids“](https://gw-fatoora.zatca.gov.sa/e-invoicing/simulation/production/csids%E2%80%9C) with the message “You are not authorized to use this api endpoint“. The strange thing is that it seems to be affecting a select few clients and we unable to understand why this is happening. The onboarding process goes as normal for other clients so it cannot be a simple system issue. Can we get some help on this? The customer has been unable to onboard their VAT for over 10 days now because the error keeps happening.