default email address not working for signup

[nerocristallo]

I want to use two different flows for signin and signup

I am currently using "email" parameter in signIn method for pre-fill the email address
FUIEmailAuth.signIn(withPresenting: rootViewController, email: "[email protected]")

This method runs when I push the signIn button

    func signin() {
              
        self.authUI.tosurl = nil
        self.authUI.privacyPolicyURL = nil
        
        if let rootViewController = self.window?.rootViewController {
            let providerFUIEmailAuth = FUIEmailAuth(authAuthUI: self.authUI, signInMethod: EmailPasswordAuthSignInMethod, forceSameDevice: false, allowNewEmailAccounts: false, requireDisplayName: false, actionCodeSetting: ActionCodeSettings())
            let providers: [FUIAuthProvider] = [
                providerFUIEmailAuth
            ]
            self.authUI.providers = providers
            providerFUIEmailAuth.signIn(withPresenting: rootViewController, email: defaultEmail)
        }
        
    }

and this one runs when I push the signUp button

    func signup() {

         self.authUI.tosurl = URL(string: "https://uptivo.fit/privacy-and-terms-of-use/")!
         self.authUI.privacyPolicyURL = URL(string: "https://uptivo.fit/privacy-and-terms-of-use/")!
         
         if let rootViewController = self.window?.rootViewController {
             let providerFUIEmailAuth = FUIEmailAuth(authAuthUI: self.authUI, signInMethod: EmailPasswordAuthSignInMethod, forceSameDevice: false, allowNewEmailAccounts: true, requireDisplayName: false, actionCodeSetting: ActionCodeSettings())
             let providers: [FUIAuthProvider] = [
                 providerFUIEmailAuth
             ]
             self.authUI.providers = providers
             providerFUIEmailAuth.signIn(withPresenting: rootViewController, email: defaultEmail)
         }
    }

It is working fine for signIn but not for signUp
Is it a bug?
Is there any other way to pre-fill the signup email address?

[morganchen12]

Do you get any errors when signing up? Are you able to sign up with the same email via Firebase Auth directly?

[nerocristallo]

I do not see any error and if I manually fill the email with "[email protected]" (or any other fake email address) then the sign up procedure works properly.

The problem is not the signup procedure itself but the content of the email field at the beginning. It should not be empty but it should be the defaultEmail that I've specified in the FUIEmailAuth.signIn method.