When the browser window launches, it should then ask you to sign in to the account you need and complete the authentication process.

If you have multiple Dropbox accounts, I recommend signing out of all of them prior to running the above code. # Then in any drop_* function, pass `dtoken = token To sign in with your Dropbox account, enter your Dropbox user name and password into the. # If you wish to save the tokens, for local/remote use To download your eBooks from Dropbox onto your Kobo eReader. # The credentials are automatically cached (you can prevent this) for future use. # Once completed, close your browser window and return to R to complete authentication. You will be prompted to log in if you aren't already logged in. # This will launch your browser and request access to your Dropbox account. You haven't provided much code to work on here but I'm assuming you're using rdrop2? In your code above, you've provided several arguments to drop_auth() but, as per the package's documentation, run drop_auth() with no arguments - this should open a browser window and allow you to authorise the connection: library(rdrop2)

Dropbox sign in problems