Connects site collection to an Office 365 Group

• command: spo site office365group set -u|--siteUrl <siteUrl> -a|--alias <alias> -n|--displayName -d|--description [description] -c|--classification [classification] --isPublic --keepOldHomepage
• siteUrl: URL of the site collection being connected to new Office 365 Group
• alias: The email alias for the new Office 365 Group that will be created
• displayName: The name of the new Office 365 Group that will be created
• description: The group’s description
• classification: The classification value, if classifications are set for the organization. If no value is provided, the default classification will be set, if one is configured
• isPublic: Determines the Office 365 Group’s privacy setting. If set, the group will be public, otherwise it will be private
• keepOldHomepage: For sites that already have a modern page set as homepage, set this option, to keep it as the homepage

For more information see the Set-SPOSiteOffice365Group cmdlet.