We used the same web game application identifier that was accessible through the facebook canvas and simple fb.login - for example, you can use the website and login using your username and password. Or you can log in using your facebook user password (for example, f connect) Or you can access our application in the canvas as a facebook application.
Facebook sent us an email saying it wasn’t allowed — using the same iD application to access the same application in different ways. We had to change the application identifier. Now it works great.
Hope that helps one way or another and is related to the original request.
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