Add-MsOMembersToGroups

MSOnline: Adds members to Azure AD groups

Script

#Requires -Version 5.1

[CmdletBinding()]
Param(
    [Parameter(Mandatory = $true, ParameterSetName = 'Names')]
    [string[]]$TargetGroupNames,
    [Parameter(ParameterSetName = 'Names')]
    [string[]]$GroupNames,
    [Parameter(ParameterSetName = 'Names')]
    [string[]]$UserNames,
    [Parameter(Mandatory = $true, ParameterSetName = 'Ids')]
    [string[]]$GroupObjectIds,
    [Parameter(ParameterSetName = 'Ids')]
    [string[]]$GroupIds,
    [Parameter(ParameterSetName = 'Ids')]
    [string[]]$UserIds,
    [Parameter(ParameterSetName = 'Names')]
    [Parameter(ParameterSetName = 'Ids')]
    [guid]$TenantId
)

Process {
    try {
        $targetGroups = @()
        if ($PSCmdlet.ParameterSetName -eq 'Names') {
            foreach ($name in $TargetGroupNames) { $targetGroups += Get-MsolGroup -SearchString $name -TenantId $TenantId -ErrorAction Stop }
        }
        else {
            foreach ($id in $GroupObjectIds) { $targetGroups += Get-MsolGroup -ObjectId $id -TenantId $TenantId -ErrorAction Stop }
        }

        $members = @()
        if ($GroupNames) { foreach ($n in $GroupNames) { $members += Get-MsolGroup -SearchString $n -TenantId $TenantId -ErrorAction Stop } }
        if ($GroupIds) { foreach ($id in $GroupIds) { $members += Get-MsolGroup -ObjectId $id -TenantId $TenantId -ErrorAction Stop } }
        if ($UserNames) { foreach ($n in $UserNames) { $members += Get-MsolUser -SearchString $n -TenantId $TenantId -ErrorAction Stop } }
        if ($UserIds) { foreach ($id in $UserIds) { $members += Get-MsolUser -ObjectId $id -TenantId $TenantId -ErrorAction Stop } }

        $result = @()
        foreach ($grp in $targetGroups) {
            foreach ($mem in $members) {
                try {
                    Add-MsolGroupMember -GroupObjectId $grp.ObjectId -GroupMemberObjectId $mem.ObjectId -GroupMemberType $mem.ObjectType -TenantId $TenantId -ErrorAction Stop
                    $result += "Member $($mem.DisplayName) added to group $($grp.DisplayName)"
                }
                catch { $result += "Error adding member $($mem.DisplayName) to group $($grp.DisplayName)" }
            }
        }
        foreach ($msg in $result) { [PSCustomObject]@{ Timestamp = Get-Date -Format 'yyyy-MM-dd HH:mm:ss'; Result = $msg } }
    }
    catch { throw }
}

Customize

TargetGroupNames string

Display names of the target groups

GroupNames string

Display names of the groups to add as members

UserNames string

Sign-In names, display names or UPNs of the users to add

GroupObjectIds string

Unique IDs of the target groups

GroupIds string

Unique object IDs of the groups to add

UserIds string

Unique object IDs of the users to add

TenantId guid

Unique ID of the tenant