I want to modify my security policy from the startup security utility. When I try so to modify the options:
• Allow user management of kernel extensions from identified developers or
• Allow remote management of kernel extensions and automatic software updates
I get: The operation couldn’t be completed. (SDErrorDomain error 104.)
Trying to install UAD Arrow and need to change the security policy.
Any help will be appreciated.
After a week of struggling I was able to fix this. I couldn't upgrade to macOS Sequoia because of the same problem(I think it is the same problem but different errors). I was getting a personalize software error and couldn't upgrade by any option(tried different variants).
So I turned Find My Mac off. Then upgraded to Sequoia(I think you can skip this if you don't want to upgrade). And after that I was able to reduce the security policy. Hope that will work for you too.