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How to link a bubble user already crated with Facebook

Hi I am trying to connect my app users with their Facebook profiles, I have created them already using #Actions.CreateUserAccount , they cannot be created by themselves.

That is why I am trying they connect themselves with their Facebook profile instead of login with Facebook, so my question is if this is possible, not to login, but link a Facebook profile with an already created bubble user? My concerns are when we logout and then login again, are they still linked? If I login to my bubble user in a different browser with an already and different Facebook profile logged in, what is going to happen here?