On Simulation Getting The provided Certificate Signing Request (CSR) is invalid

On Simulation
Getting The provided Certificate Signing Request (CSR) is invalid. ON Getting PCSID from the third API.

1 . Making CSR
2. Getting CSID Successfully (if My CSR is wrong it should show error in this step).
3. Submitting Compliance Invoices for Simplified Invoices and also done debit and credit note on same base64 decoded BinaryToken
4. When I want to generate PCSID by using request_id(getting from compilance) I m facing that error.