"Enable computer and user accounts to be trusted for delegation" rights is disabled for Administrator account despite delegation option in the "AD Computer Properties" being "Trust this computer for delegation to any service (Kerberos only)"

Hi all,

"Enable computer and user accounts to be trusted for delegation" rights is disabled for Administrator account as shown below

despite changing delegation option being "Trust this  computer for delegation to any service (Kerberos only)" as shown below

I am doing this to change the name of the domain controller that requires the above mentioned right, or else I get "access denied error".

Pls tell me how to enable the above mentioned right to the current user who is Administrator ?

Tks in advance

Joe