Getting error while apply digital certificate with multi users

[kkim]

Thank you for the clarification,

I believe if you want to sign multiple signatures that this needs to be done sequentially while separated by an incremental save.

await doc.save(filePath, PDFNet.SDFDoc.SaveOptions.e_incremental);

Here is a forum post about signing multiple signatures using our Apryse SDK: Multiple Custom Digital Signature

See this guide for more information:

Multiple Digital Signature on One Document | Apryse

Best regards,
Kevin Kim