AD user deleation not allow

I have try to delete user and end up with below error message  . I know some one who manage the system before I join enable the  accidental deletion  option enable   in the ou level . but I have take off the check box . bet still the same . when I see the domain level properties that option enable with gray color (can't deselect in the domain level )  

how can I resolve this issue

"The User has insufficient access right  
Active Directory operation failed on SRV3.local this error is not retriable ,additional information : access is denied."
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Sushil SonawaneConnect With a Mentor Commented:
Make sure your user account have sufficient user permission.

Perform below mention steps to resolve your issue.

Open Active Directory Users and Computers

Find the user

Open up the properties of this user and go to the security tab (if this is not available, choose view and then advanced features in the AD users and computers MMC) Click on [Advanced]

Activate the checkbox “Include inheritable permissions from this object’s parent” and then click [OK] twice.

For more info refer below link:

http://support.risualblogs.com/blog/2012/02/07/the-user-has-insufficient-access-rights-error-when-trying-to-set-send-as-permissions-on-a-mailbox-in-exchange-2010/

https://social.technet.microsoft.com/Forums/exchange/en-US/e370e352-dae1-45b5-8094-25d2cdc41a21/active-directory-operation-failed-on-domainlocal-this-error-is-not-retriable-exchange-2010?forum=exchange2010
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Waqar AhmedCommented:
Are you working in multisite AD ? if yes are you connected to the same domain server where you making the change ? i.e disabling accidental deletion.

if multisite domain try force resync.
check your account permissions i have you have sufficient rights to be able to make changes to AD.
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