Adobe digital signature stuck in Mac Keychain access

Long story short, I created a digital signature in Adobe Acrobat Reader, and when I saved it, it offered me to save it into iCloud / Mac password app instead of locally on the computer.

Now that I want to delete the digital signatures, the remove option in Acrobat does not work (nothing happens) and after digging a little bit, Adobe can’t remove it because it’s saved in the Apple key system. Trying to delete it in Keychain Access app on the Mac, the same thing happens: nothing happens, no error, but I can’t delete it. Or maybe locate them.

What should I do ?