Hi ,
To authorize or unauthorize a DHCP Server, you must use a user account that is a member of the Enterprise Admins security group or an account with delegated permissions for that domain.
Please check if your user account is a member of the Enterprise Admins security group.
Also Check if the following link is helpful:
[Solved] How to Fix DHCP server Authorization failed with Error Code: 20070
Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.
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