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If a digital signature isn't valid, there can be many causes. For example, the sender's certificate may have expired, it may have been revoked by the certificate authority (CA), or the server that verifies the certificate might be unavailable. Notify the message sender of the problem.

There cases where the certificates available on the server do not include the certificate chain Revolution needs. Those will need to be installed manually. Download the Go Daddy Class 2 Certification Authority Root Certificate.

The guide below is a step-by-step guide on how to fix the problem. Tap the "Signature Panel" button at the top of your PDF where the error is. Then press "Validate All" in the signature panel on the left. In the pop-up that appears, press "OK" to validate all signatures in the document.

The guide below is a step-by-step guide on how to fix the problem. Tap the "Signature Panel" button at the top of your PDF where the error is. Then press "Validate All" in the signature panel on the left. In the pop-up that appears, press "OK" to validate all signatures in the document.

In the signature Properties window click Show Signers Certificate button. Following screen will be displayed once you click on it. Once you click on OK button, following window will be displayed. ... Click Ok button in the following window. ... Once the certificate validation is done, you will get the following approval.

Provided the document isn't locked, you can then remove your own signature from the PDF by simply right-clicking the signature and choosing the Clear Signature option. This should remove the signature, allowing you to edit or re-sign the PDF.

Right-click the signature field, and select Sign Document or Certify With Visible Signature. Note: You can also create an appearance using the Signature preferences: Edit > Preferences > Signatures (Windows) or Acrobat > Preferences > Signatures (Mac OS).