We have no issue valdiating digital signed PDFs with Adobe Reader 2020 classic track, version 20.005.30334. Since version 20.005.30362 (July 2022), the signature panel shows that the signature cannot be validated for the same pdf on the same notebook. The issue persist with the latest 20.005.30381
(Aug2022). As a workaround, we have to turn off protected mode for the digital signature to be validated. Appreciate any advice from the community for this issue.