Public/TenantConfiguration/Add-CustomerDomain.ps1

function Add-CustomerDomain() {
    param(
        [Parameter(Mandatory)]
        [string]$TenantId,

        [Parameter(Mandatory)]
        [string]$DomainName
        )
    
    try {
        $IsDefault = $true

        Connect-CustomerGraph -CustomerTenantId $TenantId

        $Domain = Get-MgDomain -DomainId $DomainName -ErrorAction SilentlyContinue

        $NumberOfDomains = (Get-MgDomain).Count

        if($NumberOfDomains -ne 1) { $IsDefault = $false }

        if($null -eq $Domain) {
            Write-Host "Adding domain $($DomainName).." -ForegroundColor Yellow

            $Params = @{
                Id = $DomainName
            }

            New-MgDomain -BodyParameter $Params | Out-Null

            $VerificationCode = (Get-MgDomainVerificationDnsRecord -DomainId $DomainName | Where-Object { $_.RecordType -eq "TXT" }).AdditionalProperties.text

            $NameServer = Resolve-DnsName -Name $DomainName -Type NS -ErrorAction SilentlyContinue
            if ($NameServer.NameHost) { $NameServer = $NameServer.NameHost }
            else { $NameServer = 'Not Found'}

            if($NameServer -like '*.curanet.dk') {
                $DNSRecords = Get-CuraDNSRecords -DomainName $DomainName

                if ($DNSRecords.status -ne 404) {
                    New-CuraDNSRecord -DomainName $DomainName -Type "TXT" -Value $VerificationCode | Out-Null
                }
                else {
                    Write-host "Please add the following DNS record to your DNS provider:" -ForegroundColor Yellow
                    Write-host "Type: TXT" -ForegroundColor Yellow
                    Write-host "Name: @ or leave blank" -ForegroundColor Yellow
                    Write-host "Value: $($VerificationCode)" -ForegroundColor Yellow
                    Write-host "TTL: 3600" -ForegroundColor Yellow
                    Read-Host "Press any key to continue.."
                }
            }
            else {
                Write-host "Please add the following DNS record to your DNS provider:" -ForegroundColor Yellow
                Write-host "Type: TXT" -ForegroundColor Yellow
                Write-host "Name: @ or leave blank" -ForegroundColor Yellow
                Write-host "Value: $($VerificationCode)" -ForegroundColor Yellow
                Write-host "TTL: 3600" -ForegroundColor Yellow
                Read-Host "Press any key to continue.."
            }

            Write-Host "Verifying domain.." -ForegroundColor Yellow

            Start-Sleep -Seconds 10

            Confirm-MgDomain -DomainId $DomainName | Out-Null

            if( $IsDefault) {
                Write-Host "Setting domain as default.." -ForegroundColor Yellow
                Start-Sleep -Seconds 5
                Update-MgDomain -DomainId $DomainName -IsDefault | Out-Null
            }

            Write-Host "Domain $($DomainName) has been successfully added!" -ForegroundColor Green
        }
        else {
            Write-Host "Domain $($DomainName) already exists, skipping.." -ForegroundColor Yellow
        }
    } catch {
        throw "Failed to add domain: $_"
    }
}