After connecting to the iPhone, I get the same message
You have signed in to this account incorrectly.
To continue using this service, please sign in again. Tap the Confirm button to sign out and return to the previous screen.
※ Precautions for using Samsung Account
∙ Clearing your browser’s cookies will also delete information about the account you have signed in to. ∙ In settings on your browser, please allow sites to save and read cookie data. ∙ Please set the browser that you used to sign in to Samsung Account as the default app.
But it is not possible to log in or log out of your Samsung account on this page