Adobe install DUO certificate
Open a file which should contain a certificate from DUO.
The blue bar at the top of the file warns about a not validated certificate.
Click on Signature Panel on the right side.
Right click the certificate that is shown on the left side.
Click Show Signature Properties.
Click on Show Signer’s Certificate….
Open the tab Trust.
Click Add to Trusted Certificates….
Tick the box Use this certificate as a trusted root and click OK.
The DUO.nl certificate should now be installed in Acrobat Reader.
Last modified: 22/01/2020