Hello @Natalie Harzic ,
Please following steps:
1.Go to the Active sites page of the new SharePoint admin center, and sign in with an account that has admin permissions for your organization.
2.On the left column, select a site.
3.Select Permissions.
- For a group-connected team site, you can add and remove group owners and additional site admins.
- For other sites, you can add and remove site admins and change the primary admin. Note that if you remove a person as a primary admin, they will still be listed as an additional admin.
For more information, please see "Manage site admins" article.
Thanks,
Echo Du
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Updated Answer ====================
Hi @Natalie Harzic ,
Add Site Collection Admin to All SharePoint Online Sites using PowerShell:
#Variables for processing
$AdminURL = "https://Crescent-admin.sharepoint.com/"
$AdminName = "SPAdmin@Crescent.com"
#User Names Password to connect
$Password = Read-host -assecurestring "Enter Password for $AdminName"
$Credential = new-object -typename System.Management.Automation.PSCredential -argumentlist $AdminName, $Password
#Connect to SharePoint Online
Connect-SPOService -url $AdminURL -credential $Credential
$Sites = Get-SPOSite -Limit ALL
Foreach ($Site in $Sites)
{
Write-host "Adding Site Collection Admin for:"$Site.URL
Set-SPOUser -site $Site -LoginName $AdminName -IsSiteCollectionAdmin $True
}
Thanks,
Echo Du
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