Today, we’re excited to announce the availability of OAuth 2.0 authentication via client credentials grant flow for the POP and IMAP protocols for accessing Exchange Online mailboxes.
Applications ...
Updated Jun 30, 2022
Version 2.0
Blog Post
1 MIN READ
Announcing OAuth 2.0 Client Credentials Flow support for POP and IMAP protocols in Exchange Online
Requesting the token does not have GraphAPI involved yet, it is the Microsoft's Identity.client package wrapped that token request, so I won't know the https request in details.
If you use Java, I think you can try the library msal4j quickly, (again, this is a working code you can verify it is your code or the AD setup)
I highly recommend you create an Azure developer sandbox, and add configuration for a testing o365, which will significantly cut the development time before you go for your IT admin.
implementation 'com.microsoft.azure:msal4j:1.13.9'
import com.microsoft.aad.msal4j.*;
private String getToken() {
String token = "";
String clientId = "xxxxxxxxxxxxxxxxxxxxx";
String clientSecret = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
String tenantId = "xxxxxxxxxxxxxxxxxxxxxxxx";
String authority = "https://login.microsoftonline.com/" + tenantId;
IConfidentialClientApplication app = null;
try {
app = ConfidentialClientApplication
.builder(clientId, ClientCredentialFactory.createFromSecret(clientSecret)).authority(authority)
.build();
} catch (MalformedURLException e) {
e.printStackTrace();
}
Set<String> scopes = Collections.singleton("https://outlook.office365.com/.default");
try {
ClientCredentialParameters parameters = ClientCredentialParameters.builder(scopes).build();
IAuthenticationResult result = app.acquireToken(parameters).get();
// The access token can be obtained from the result
token = result.accessToken();
System.out.println("Access Token: " + token);
} catch (Exception ex) {
System.out.println("Error occurred: " + ex.getMessage());
}
return token;
}