Exchange 2016 failed to schema update

Chong 846 Reputation points

Hi Support,

Our exchange 2016 is cu9 which install in child domain, and will patch to cu19. When we run the "prepareschema" in root domain's Schema master DC, it show below error:


  • We checked the account is member of "Schema Admin", "Enterprise Admin", "Domain Admin" and "Organization Management".
  • The forest functional level and domain functional level is 2016
  • Tried to create another admin account with required permission also have the same error.
  • Tried to run the "prepareschema" in other server which in the same AD site
  • All DC restarted and replication is good

Any idea?


Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Troy Werelius 76 Reputation points
    • Sounds like an DNS related issue so I would start by validating the Exchange Server DNS settings are correct
    • The other action to consider would be to do an AD Health check
    • I would also check the local groups to ensurer there are no abandoned/orphaned entries, i.e. they will show as a GUID vs a username

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  2. Joyce Shen - MSFT 16,651 Reputation points

    Hi @Chong

    Please check the ExchangeSetup log to see more related information. Make sure you have meet all the prerequisites list in the official document here: Exchange Server prerequisites

    In addition, have you tried running the prepare AD command manually? Prepare Active Directory and domains for Exchange Server

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  3. Chong 846 Reputation points

    Hi @Joyce Shen - MSFT

    I double check the prerequisites and my environment should meet the requirement. The Exchange log don't have more detail, I can see the same error message as the capture screen and many "Active Directory operation failed on . The supplied credential for 'domain\admin' is invalid." error. But the account should be member of "Schema Admin", "Enterprise Admin", "Domain Admin" and "Organization Management".

    I didn't try to run the prepareAD command, as the prepareSchema command not work. I know run prepareAD will include prepareSchema also. But have any different with run the prepareSchema first?