Using PowerShell I can update a site collection secondary administrator (as farm administrator):

Set-SPSiteAdministration -Identity http://contoso/sites/test -OwnerAlias "domain\testuser"

This works fine. But how can I remove the secondary administrator using PowerShell? So reverse the above.


For removing you can try this one.

Get-SPSite http://contoso/sites/test | Set-SPSite -SecondaryOwner $null


Also Check this post : SharePoint: Add/Remove Site Collection administrators with Powershell

  • 1
    Unfortunately it does not work. Secondary owner is still showing in 'change site collection administrators' – LightningWar Jul 18 '18 at 14:45
  • did you try to second link? – Waqas Sarwar MVP Jul 18 '18 at 15:02

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