Preparing AD Schema Fail

Question

Hey,

Trying to install Exchange 2019 for the first time as we are 100% Office365.

running the following command
E:\Setup.exe /IAcceptExchangeServerLicenseTerms /PrepareAD /TenantOrganizationConfig C:\Temp\MyTenantOrganizationConfig.XML /OrganizationName:"xxxxxxxxxxxx"

It errors out when i open the lfif.err file i get the below error

Entry DN: CN=ms-Exch-Hide-From-Address-Lists,CN=Schema,CN=Configuration,DC=xxxxxxx,DC=xxxxxxxx,DC=com,DC=au
Add error on entry starting on line 123: Unwilling To Perform

The server side error is: 0x20be Schema update failed: duplicate LDAP display name.

The extended server error is:

000020BE: SvcErr: DSID-0326036D, problem 5003 (WILL_NOT_PERFORM), data 8382
Im logged in as a Schema and Enterprise Admin user.
I go to the Schema and found the above attribute and try to defunct the attribute i get the below error
"Cannot make this schema object defunct
the Schema object may be in use as part of the definition of another schema object Or, schema may not be allowed on this computer."

I have added the Registry edit to allow this machine to edit the schema.
Scratching my head with this one, anyone got any ideas?

Regards,
Ben

Answer 1

Can you try ranaming the attribute in adsi.edit and run Prepare schema again?

Or run ldp.exe, connect to your DC server and login with admin account, create a filter like:

Filter = (ldapDisplayName = mailnickname)  
  

Find the existing attirbute and test if you can delete or rename it.

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