This guide explains the settings that must be made so that signed certificates can be verified.
This process remains even if a new user certificate is added.
The configuration of the personal certificate can be found here:
Please download the file "adobe.acrobatsecuritysettings" from the "Attachments" section (right side).
Open the Adobe Acrobat Reader preferences.
On macOS, you need to click on "Acrobat Reader" and select settings:
On Windows, you have to click on "Menu" and there on Settings:
Navigate to "Security".
Under "Security Settings", click "Import".
Select the previously downloaded "Settings file" and confirm with "Open".
Click "Import" in the upper right corner.
Confirm the first message with "Yes".
Confirm the second message with "Yes".
You will receive a success message and have now prepared Adobe for use with the certificates.