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Adding the certificate that was used to apply the digital signature into Adobe's list of Trusted Identities by some easy steps.
Adobe Reader or Acrobat displays a At least one signature has problems message when signed PDF is opened. Signature validity is UNKNOWN. Signer's identity is unknown.
Developer Guide for Foxit PDF SDK for Android 8.0
Unable to Sign Document Even though Signing Security Permissions Are Allowed – Help Center
Error when signing PDFs with Adobe Acrobat Reader DC - certSIGN
How could I access the Fill & Sign feature in Foxit PDF Reader 11.2.1 and other newer versions of the V11.x series? – Help Center
FoxIt message At least one signature has problems, cannot edit the .pdf – Rocky Mountain Human Services
Signing your pdf documents. Scenario: You want to sign & certify a…, by Matthew Pulis
PDF Reader shuts down unexpectedly when opening multiple signed documents. – Help Center
At least one signature has problems Error in Adobe Reader
How to fix the error 'Adobe Reader could not open because it's either not a supported format or has been damaged' - Quora
