AddGroups.ps1

if ($Prefix.Length -gt 2) {
   Write-Output 'Welcome'
} else {
    throw '$Prefix missing'
}

Write-Output 'Groups overview'
$Groups = Get-AzADGroup -DisplayNameStartsWith $Prefix | ? DisplayName -like *Access
$Groups | Format-Table
$Groups | % {Write-Output "$($_.DisplayName) members count: $((Get-AzADGroupMember -ObjectId $_.Id).Count)"}

$AccessList = @('ACR', 'KV', 'SBI')
Write-Output 'Verify groups...'
foreach ($A1 in $AccessList) {
    $Name = "$Prefix$A1" + "Access"
    if ($Name -notin $Groups.DisplayName) {
        throw "Group $Name not found"
    }
}
Write-Output 'Groups verified successfully'

Write-Output 'Updating groups interactivly...'
foreach ($A1 in $AccessList) {
    $Name = "$Prefix$A1" + "Access"
    Write-Output "Processing group: $Name"
    $GroupID = $null
    $GroupID  = Read-Host "Enter ObjectID for a group which should be granted $A1 access or leave blank if none"
    if (!$GroupID) {
        Write-Output "Skipping $A1 access"
        continue
    }
    $NewGroup = $null
    $NewGroup = Get-AzADGroup -ObjectId $GroupID
    if (!$NewGroup) {
        Write-Error "Group with object ID $GroupID not found."
        continue
    }
    Write-Output "Group $($NewGroup.DisplayName) found."
    $Members = $null
    $Members = Get-AzADGroupMember -GroupDisplayName $Name
    if ($GroupID -in $Members.Id) {
        Write-Output "Group $($NewGroup.DisplayName) is already in the group $Name. Skipping it."
    } else {
        $Answer = $null
        $Answer = Read-Host "Confirm adding $($NewGroup.DisplayName) to $Name. (Y/n)? "
        if ($Answer -like 'n') {
            Write-Output "Skipping it. "
        } else {
            Write-Output "Adding group member... "
            Add-AzADGroupMember -MemberObjectId $GroupID -TargetGroupDisplayName $Name
            Write-Output "Adding done. Let's verify it..."
            Start-Sleep 1
            $NewMembers = Get-AzADGroupMember -GroupDisplayName $Name
            if ($NewMembers.Count -eq ($Members.Count+1)) {
                Write-Output "All fine"
            } elseif ($NewMembers.Count -eq $Members.Count) {
                Write-Error "Something failed! Group have the same number of members."
            } else {
                Write-Error "Something failed! Group had $($Members.Count) members before and now it has $($NewMembers.Count) members."
            }            
        }
    }    
}
Write-Output 'All done. Have a nice day!'