Cannot delete DHCP scope

Cannot delete DHCP scope.  It states the subnet does not exist.  Windows Server 2012 R2

How do I remove it to create a new one?
J.R. SitmanIT DirectorAsked:
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Vikas BhatExperienced IT Infrastructure Services/operations ManagerCommented:
R@f@r P@NC3RVirtualization SpecialistCommented:
Hello

Try removing the IP addresses manually from that area, and then delete the scope.

regards..

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J.R. SitmanIT DirectorAuthor Commented:
The first link was not my issue.  Removing the IP's solved it.

One question, I created a failover DHCP server.  Then shortly after I changed the DNS servers in the scope, however, on the other server the DNS servers did not change.  Should this happen automatically or does the scope have to be changed manually?
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R@f@r P@NC3RVirtualization SpecialistCommented:
Hello

Did you refresh the changes on the other server ?. if not, configure the manual environment and validate the changes.

I remain attentive to your comments.

regards..
Shaun VermaakTechnical SpecialistCommented:
I believe you need to use this

Automatic syncing of configuration changes between 2 DHCP failover servers
https://gallery.technet.microsoft.com/scriptcenter/Auto-syncing-of-configurati-6eb54fb0
J.R. SitmanIT DirectorAuthor Commented:
I thought I had posted a reply, but I guess not.  I did delete the IP'd and then the scope.
J.R. SitmanIT DirectorAuthor Commented:
thanks
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