If you add the Office 365 Teams trail to you tenant, and you will like to give that license to all users, this is the command you can run:
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New-MsolLicenseOptions -accountskuid aarhuslo:TEAMS_COMMERCIAL_TRIAL Get-AzureADUser | where {$_.UserPrincipalName -like "*@Domain.prefix*"} | Set-MsolUserLicense -AddLicenses $x |