# first install Azure Ad module in PowerShell
Install-module AzureAD

#Store the credential and use these credentials to connect to Azure AD.
$Credentials = Get-Credential
Connect-AzureAD -Credential $Credentials

# Provide Name to the App Name for example PowerBI app
$appName = "PowerBI App "

# Provide the App URI for App. This would be the App home Page. examples could be #"http://localhost:4200" or https://MyPowerbiReports/
$appURI ="http://localhost:4200"

# Now check if App with this name already created ? If it is not created then create it otherwise do not create it.
if(!($myApp = Get-AzureADApplication -Filter "DisplayName eq '$($appName)'" -ErrorAction SilentlyContinue))
{
$myApp = New-AzureADApplication -DisplayName $appName -IdentifierUris $appURI
}

# Get the App details
$appName = "PowerBI App"
Get-AzureADApplication  -All $true | ? { $_.DisplayName -match $appName }

#Please store these details in safe place because you may use it for further programming.