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windows 2012 verification of replica failed whilst deploy AD onto windows 2003 domain

hi, I have a 2003 sbs network, I'm migrating to windows 2012 server.
So far I have increased the domain function level from 2000 to 2003 and done an adprep /forest on the 2012, which updated the 2003 sbs.
then added roles of AD domain services.
when I go to promote the 2012 and add domain controller to an existing domain, I get.

verification of replica failed. the forest functional level is windows 2000....

but under raise domain function it has windows server 2003.
There doesn't seem to be any event errors.

what am I doing wrong.
Windows Server 2012Windows Server 2003SBS

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Zsolt Pribusz

8/22/2022 - Mon