Unable to remove uchg user immutable flag/lock with root user
Current app file permissions:
When I run
# file location
cd /Applications
# show flags
ls -lO | grep <app>
# "drwxr-xr-x 3 root wheel uchg 96 Dec 1 2021 <app>.app"
# via sudo, fails
sudo chflags nouchg <app>.app
# via su, fails
su root
chflags nouchg <app>.app
I get
chflags: <app>.app: Operation not permitted
I've already tried disabling system integrity protection and granting full disk access to Terminal.
csrutil status
# "System Integrity Protection status: disabled."
How can I unlock this file?
Also asked at https://apple.stackexchange.com/q/457333/320992