# To run on Linux, you need the preview mode of AzureAD
# Register-PackageSource -Trusted -ProviderName ‘PowerShellGet’ -Name ‘Posh Test Gallery’ -Location https://www.poshtestgallery.com/api/v2/
# Install-Module -Name AzureAD.Standard.Preview

# Windows, the module is
# Install-Module -Name AzureAD

# I’m lazy and just typed my creds for a proof of concept; real implementation would use the SecureString thing in the connect-azuread. See:
# https://www.rushworth.us/lisa/?p=3294
connect-azuread

# Get the object ID for the group and the user
$objMyGroup = get-azureadgroup -SearchString “LJR Sandbox Team”
$objNewMember = get-azureaduser -searchstring “NewGuy”

# Add the user to the group
add-azureadgroupmember -ObjectID $objMyGroup.ObjectId -RefObjectID $objNewMember.ObjectId