I'm unable to validate signatures in Adobe for all users logging onto an image. I have already uninstalled adobe and deleted the programdata folder and reinstalled the most recent version of adobe (2021.001.20145)
When I open any signed document, there is shown that the document is signed by unknown. I'm unable to open the certificate details as this link is unresponsive.
When checking Preferences > Signatures > Identities & Trusted Certificates I receive the following error:
File or folder does not exist.
Often it also happens when opening a signed document, when adobe tries to validate the license the following error is shown and the application closes:
Invalid Plugin Detected. Adobe Acrobat Reader DC will quit.