As announced in this post in the Microsoft Tech Community, the ability to add a new Office 365 Group to an existing SharePoint Online (SPO) site is finally coming to Office 365:
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As an example, let’s start with an existing SPO classic site:
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Open your favorite PowerShell tool (Note: Be sure to previously update your SPO Management Shell installation with the latest version available) and execute the following PowerShell sequence:
$sUserName="<Office365_User>@<Office365_Domain>.onmicrosoft.com" $sMessage="Type your Office 365 Credentials" $sSPOAdminCenterUrl="https://<Office365_Domain>-admin.sharepoint.com" $sClassicSPOSite="https://<Office365_Domain>.sharepoint.com/sites/<Site_Name>/" $O365Cred=Get-Credential -UserName $sUserName -Message $sMessage Connect-SPOService -Url $sSPOAdminCenterUrl -Credential $O365Cred $sGroupDisplayName="<Group Display Name>" $sGroupAlias="<GroupAlias>" Set-SPOSiteOffice365Group -Site $sClassicSPOSite -DisplayName $sGroupDisplayName -Alias $sGroupAlias -IsPublic $true
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Once above PowerShell sequence is executed, just check the new Office 365 Group has been provisioned and also the following elements: a new modern home page for the SPO site, an EXO mailbox and a Planner Plan.