❔ Optional parameter throwing error

 
public UserAccount CreateOrUpdateUserAccountWithEmailSubscriptions
(string email, bool isNewsletterSubscribed, out bool isExists, bool signUp = false)
{

}

 
public UserAccount CreateOrUpdateUserAccountWithEmailSubscriptions
(string email, bool isNewsletterSubscribed, out bool isExists, bool signUp = false)
{

}

                       _authenticationService.CreateOrUpdateUserAccountWithEmailSubscriptions(user.Email, viewModel.PatientInfoEmailEnabled, out var isExists);

                       _authenticationService.CreateOrUpdateUserAccountWithEmailSubscriptions(user.Email, viewModel.PatientInfoEmailEnabled, out var isExists);