Flow create guest

[Patrick Sanouiller]

I would like to create guest user with Flow but get badrequest on this http step:

Method Post 

URI         https://login.microsoftonline.com/common/oauth2/token

Headers Content-type  application/x-www-form-urlencoded

Body

{
"grant_type": "authorization_code",
"client_id": "Azure Application ID",
"client_secret":"Azure Application Secret Key",
"scope":"user.add",
"code":"req.query.code"
}

What's wrong?

[#2]

@Patrick Sanouiller 

I'd recommend you post this question in the Flow Community as you will likely get a quicker reply there. 

Doug