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Issue Validating Signature or AATL Signed Document

New Here ,
Sep 22, 2025 Sep 22, 2025

Hi,

We are using an AATL Doc signing certificate to sign documents and that works as expected for everyone within the company except one user. When opening his signed document, the validation fails. If someone send this user a signed PDF that leverages AATL, it fails and shows UNKNOWN. However, if this user runs Adobe Acrobat reader first and uses "Run as Admin" context, then the validation succeeds for his signed document and other docs signed by someone else.

Has anyone seen this issue?

__PRESENT

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Adobe Employee ,
Sep 23, 2025 Sep 23, 2025

Hi gifted_website0D45,

 

Thank you for reaching out, and sorry about the trouble caused.

 

As the issue occurs with a particular user, please ask the user to reinstall the application using the steps suggested below:

- Remove the application and run the cleaner tool (https://adobe.ly/4pyXKzX).
- Reboot the machine
- Install Adobe Acrobat Reader from the following page: https://adobe.ly/46BFRaT.

Check if that helps.

 

If the issue still occurs, let us know.

 

Thanks,

Meenakshi

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New Here ,
Sep 23, 2025 Sep 23, 2025
LATEST

Thanks for the suggestions. The user has already uninstalled Adobe Acrobat Reader and then re-installed it, but that did not work. Let me have the user retry according to the documentation that you provided. and report back here.

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