I have exact the same problem as describe here: "User interaction is not allowed" trying to sign an OSX app using codesign
So now I want to change the private key access control to Allow all applications to access this item. When I check this option everything looks fine; I've been asked to enter the administrator password and after that the windows closes.
But when I check the Access Control of the key again the other option is checked again; only allow list of applications...