Cannot Change Admin Password

Hi there,

I recently reinstalled the OS Catalina, and initially as a user password, I used my Apple ID.

Now, I am trying to change the password for both login and root access. However, the system does not allow me to change it. The error message reads:

Your system administrator may not allow you to change your password or there was some other problem with your password. Contact your system administrator for help.

Of course, It does not work, even if the lock down below is unlocked.