Per the documentation, after installing the app you must configure it. Under the "Configuring Microsoft Graph Security data inputs" section it details the account information you need to enter (Account Name, Application ID and Client Secret registered). However, when I click Add (Configuration > Account) I'm prompted for Account name, Username, and Password. Not those other values.
I've installed 1.2.3 and 1.2.4 and I see the same Add Account options in both. Is there another way I can configure those values? I'm running Splunk Enterprise 220.127.116.11 on Centos.