I need to support the following use case:
* Player enters game
* Login with anonymous ID\Facebook Login
* After some time, I want to offer to the user the option of creating a "Full" account, one with email/password as well as their previous integration.
On the docs I see that you can start with an email/password account and then link other services, however seems like the reverse is not possible, starting with a facebook account link and then adding email/password at a later time.