I needed to get Azure AD Access Token by using hard-coded username and password. To do so, we can use grant_type=password.
Prerequisites
I registered an application to Azure AD to user for this.
PowerShell script
I used following PowerShell script to get access token. As I didn't want to user MSAL as part of script, so I simply use Invoke-RestMethod.
$body = 'grant_type=password' + ` '&client_id=<client id>' + ` '&username=<user>@<yourdomain>.onmicrosoft.com' +` '&password=<user password>' +` '&resource=<resource i.e. https://graph.microsoft.com>' +` '&client_secret=<client secret>' +` '&scope=<score i.e. User.Read>' $token = (Invoke-RestMethod -Method Post -Uri https://login.microsoftonline.com/common/oauth2/token -Body $body).access_token 
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