Issues with signature not saving to file

[Celestial_doer3342]

Hello 👋

I’m experiencing an issue where my digital signature is intermittently not being written to the PDF, even though the signing process appears to complete normally.

When signing a document, I enter my certificate PIN/key as expected. Acrobat then shows the usual signing progress bar and saves the file. However, in some cases, after the save completes, the document is marked read-only but the signature itself is missing from the PDF. There are no error messages shown.

To try to resolve this, I’ve made the following changes:
• Menu → Preferences → Signatures → Digital Signatures → Creation & Appearance
• Changed Default Signing Format from PKCS#7 – Detached to CAdES-Equivalent
• Menu → Preferences → Signatures → Digital Signatures → Verification
• Unchecked “Require certificate revocation checking to succeed whenever possible during signature verification”

Additional details and troubleshooting already attempted:
• Running Windows 11 24H2
• Tested saving files locally (not on a NAS or network location)
• Rebooted both the system and Adobe Acrobat
• Issue occurs intermittently — some signatures succeed, others silently fail

At this point, the signing workflow completes, but the signature is occasionally not committed to the document.

Any insight into what might cause the signature write step to fail silently, or where additional logging can be found, would be appreciated.

Thank you

[creative explorer · Accepted solution]

@Celestial_doer3342 that's great you at least tried a couple of ways;  I would go back to 
Menu → Preferences → Signatures → Identities & Trusted Certificates  → More  → (export a back-up copy just in case to your desktop or yourself)  → Remove ID, and then create a new ID

https://helpx.adobe.com/acrobat/desktop/protect-documents/manage-digital-ids/digital-ids.html