It would appear that the Admin Account has Lost its' privileges as an Admin Account.
The supplied link may help regain your Admin Privileges again
That or >>
Reset Computer Password for the Administrator Account Password
Intel Computer
1 - Restart computer and immediately hold Command + r keys
2 - Top Tool Bar >> Utilities >> Terminal
3 - Type resetpassword as one word and no spaces
4 - Press Return key
5 - Follow the prompts and remember the New Password
Apple Silicon M1 / M2 Computer
1 - Choose Apple menu > > Shut Down.
2 - Press and hold the power button on your Mac until you see “Loading startup options.”
3 - Click Options, then click Continue.
4 - Top Tool Bar >> Utilities >> Terminal
5 - Type resetpassword as one word and no spaces
6 - Press Return key
7 - Follow the prompts and remember the New Password