Dear royaouad,
please make sure that you are using the production CSID and not the compliance CSID for signing invoices.
In the onboarding process, 2 CSIDs (X509 certificates) will be returned.
First one: after requesting the compliance CSID API, (which is the first step to do in onboarding process), we use this certifecate to sign invoices for the compliance checks step (compliance Invoice API), so we only use this certificate to sign invoices for the testing purposes in the compliance checks phase, as invoices in compliane checks are not being sent to ZATCA.
Second one: after requesting the production CSID API, we use this certificate to sign real invoices that are being sent to ZATCA by reporting API for simplified invoices or clearance API for standard invoices, however signing standard invoices is optional & not mandatory.
so what suggested is to make sure that you are using the PCSID X5509 certificate to sign your invoices,and check again.
thank you,