No puedo firmar digitalmente mediante certificado digital

Hi there,

Hope you are doing well and thanks for reaching out and sharing the details.

Since the same certificate works on your Windows computer and with other programs, the issue seems to be specific to Acrobat Reader on Mac. A few things you can try:

Update Acrobat Reader – Make sure you’re running the latest version (25.01.20623) of Acrobat Reader for Mac. Go to Help > Check for updates and reboot the computer once. 

Check Keychain Access – On macOS, certificates are managed in Keychain. Open Keychain Access, locate your certificate, and confirm it is trusted. If not, try reimporting it.

Enable “Use modern interface for signing” – Go to Preferences > Signatures > Creation & Appearance > More, and enable the option for modern signing (if available). Sometimes the classic signing interface causes this loop.

Run a test on another PDF – Try signing a new, simple PDF (not password-protected or secured). This helps check if the issue is file-specific.

Reset Acrobat preferences as described here  https://adobe.ly/4oJgT1k and reboot the computer once.

If it still doesn't work, please remove the application using the Acrobat cleaner tool https://adobe.ly/4fII3kQ , reboot the computer and reinstall the application using the direct link https://adobe.ly/3V82HkZ  

If the issue still exists, please share your macOS version and Adobe Acrobat version to help narrow it down further.

~Amal