Hi @Argho Das ,
You can try following solutions to enable Digital Signature validation:
- Enable Enable Digital Signature for PDF flag at edge://flags/#edge-digsig-enabled-pdf.
- Enable PDFSecureMode policy. If you are not familiar group policy configuration, you can read this guide to set up the environment first.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.
Best Regards,
Shijie Li