Has anyone been refused permission to make changes in mac big sur

I’m just trying to use my scanner through

That would have been a useful addition to the original post.

'You do not have permission to open the application' when using a scanner on Mac - Apple Support

trying to delete a system file the operating system uses

There are some areas of the OS and its system files which are no longer accessible to make changes; that part of the OS is now sequestered in a read only volume on your hard drive - part of the newest security features implemented in

Catalina:

https://support.apple.com/en-us/HT210650

Yes.

You apparently are confused by the term, "Administrator."

A user who has the capability to administer the computer is not omnipotent. An admin user on macOS has the ability to elevate its privileges to make some changes to the computer, but that does't imply any other special privileges.

Being an administrative user doesn't allow you to access much of anything. Even logging in as root doesn't allow much "super user" capability at all.

I've only received that message when trying to delete a system file the operating system uses. I'd try creating an additional Admin account and see if it still happens.