At least one signature is invalid

Hi Skim,
Please take a look at this forum post: https://community.onespan.com/forum/signatures-not-trusted.

Duo_Liang provides steps on how to fix this issue. If you have any follow up questions, don't hesitate to ask.
 

Hello Gabriel, 

Thanks for the reply,

Before posting this question, we found the same post and tried, but it does not work for us unfortunately, 

When we try doing the same (clicking View Signer's Certificate button in the screenshot), nothing happens :(

Hi Skim,
This is not an expected behavior, but I'll try to help you. You can try updating the Automatic Adobe Approved Trust List via Adobe Acrobat by following these steps:
1. Select the Adobe account icon and click on "Preferences"

2. Navigate to "Trust Manager" and select "Update Now"

OneSpan Sign is a part of the Adobe Approved Trust List, via our certificate issuer "Global Sign". Updating the list can resolve the "Invalid signature issue". If this doesn't fix your issue, let me know and I'll dig deeper to try and find the answer to your problem.

Hello Gabriel,

Unfortunately, following the provided procedure did not solve the issue.

I think the issue is it  not on the Adobe side.

Is there possibility where this issue can happen while signature process?