I have integrated firebase with my PHP based web application.
When I try to login with Facebook, I am getting the following error:
code: "auth/internal-error"
message: "Duplicate credential received. Please try again with a new credential."
This error occurs when the user has already logged in with Facebook previously. It shows the following screen (that too only in safari browser) and then the above error occurs.
Strangely, this error occurs (intermittently) in the Safari browser. It doesn't happen in Chrome browser.