Hi,
Whenever you call DoFBOAuthandGetToken API it actually opens browser for login. If you want to do it again and again then
-
Unchecked the keep me logged in option on browser, when loggedIn from facebook.
Because whenever you navigate to browser it opens the same session again.So first do logout from browser then it will be working fine.
Let me know if it works.
Thanks & Regards
Vishnu garg