$clientID="7c6cbd92-073b-4bc9-9d4a-fc27749f340b";
$newClientSecret = "p/zEuKBqkZRQsz6yRpOafj2f6zZdnQYvONatGWj0N0M=";
$appDomain="Yourdomain.azurewebsites.net";
$appUrl="https://Yourdomain.azurewebsites.net/";
$appName="Your App Name"
$servicePrincipalName = @("$clientID/$appDomain")
$dtStart = [System.DateTime]::Now
$dtEnd = $dtStart.AddYears(10)

Connect-MsolService
New-MsolServicePrincipal -ServicePrincipalNames $servicePrincipalName -AppPrincipalId $clientID -DisplayName $appName -Type Symmetric -Usage Verify -Value $newClientSecret -Addresses (New-MsolServicePrincipalAddresses -Address $appUrl) -StartDate $dtStart  –EndDate $dtEnd
New-MsolServicePrincipalCredential -AppPrincipalId $clientId -Type Symmetric -Usage Sign -Value $newClientSecret -StartDate $dtStart  –EndDate $dtEnd
New-MsolServicePrincipalCredential -AppPrincipalId $clientId -Type Password -Usage Verify -Value $newClientSecret -StartDate $dtStart  –EndDate $dtEnd