Example script to hide the "Teamify" Dialog box on all M365 group connected sites

Disable-TeamifyDialog.ps1

#requires -modules "PnP.PowerShell"

# permission requirements
#   - Microsoft Graph > Application > one of Directory.Read.All, Directory.ReadWrite.All, Group.Read.All, Group.ReadWrite.All, GroupMember.Read.All, GroupMember.ReadWrite.All
#   - SharePoint > Application > Sites.FullControl.All

Connect-PnPOnline `
            -Url         "https://$env:O365_TENANT-admin.sharepoint.com" `
            -ClientId    $env:O365_CLIENTID `
            -Thumbprint  $env:O365_THUMBPRINT `
            -Tenant      $env:O365_TENANTID `
            -ErrorAction Stop

$m365GroupsWithNoTeam = Get-PnPMicrosoft365Group -IncludeSiteUrl | Where-Object -Property HasTeam -eq $false

$createdDate = [DateTime]::Today.AddDays( -10 ) # adjust as needed

foreach( $group in $m365GroupsWithNoTeam )
{

    if( $group.CreatedDateTime -gt $createdDate )
    {
        Connect-PnPOnline `
                    -Url         $group.SiteUrl `
                    -ClientId    $env:O365_CLIENTID `
                    -Thumbprint  $env:O365_THUMBPRINT `
                    -Tenant      $env:O365_TENANTID `
                    -ErrorAction Stop

        Set-PnPSite -NoScriptSite $false

        Set-PnPPropertyBagValue -Key "TeamifyHidden" -Value "TRUE" #

        Set-PnPSite -NoScriptSite $true
    }
}