dhcp configure failover failed error 20010

DHCP configure failover failed error 20010.  Primary DC/DHCP/DNS Windows 2012 server comes up with error when i configuring dhcp failover. The other server is Windows 2012 R2. I did google search and found few suggestion but none helped. I have shoretel custom defined option that is also entered in 2nd dhcp server but still gives an error. Any idea? Thanks!
MoonLiveAsked:
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Sam Simon NasserIT Support ProfessionalCommented:
can you tell us the suggestions that did not work?
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MoonLiveAuthor Commented:
Custom Option worked. I didn't look all the scopes at first that one of the scope has special setting for my aruba ap. Once i have to configure.
Everything went over correctly. Thanks
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MoonLiveAuthor Commented:
For extension of this question, while I am configure Failover DHCP server Windows Server, What happen when primary server down and partnet DHCP server respond for ip helper address on network gears? Are partner DHCP server knows that? or do i need to add second ip helper address on the router/switch for that option?
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MoonLiveAuthor Commented:
figure out my own.
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Windows Server 2012

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