Integration with Graph API

Hi all,

I'm trying to integrate with Microsoft's Graph API and I'm having a bit of trouble. When attempting to get the bearer token, I'm being returned a html page. 

Graph API returning HTML and not json (microsoft.com) <- This source suggests that setting the outgoing content type would resolve this, however I'm not sure where on the integration to put this.

I'm quite new to using the Graph API at all and so I'll admit the set up I've gone for may be wrong. Could anyone advise on the authorization/access/token process to get the bearer token in Appian?

Thanks in advance.

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