SwiftUI - only one alert showing in nested if

So I am creating a register view and I have two alerts to show. One is showing if the email or the password don't meet the requirements and the other one is used if the email is already saved in the system. The issue is that the single alert showing up is the one that checks if the email and password meet that set of requirements.

Button ("Sign Up") {
                    toggle.toggle()
                    
                    if (isValidEmailAddr(strToValidate: userCredentials.email) && isValidPassword(strToVailidate: userCredentials.password)) {
                        if !emailDoesExist(emailToCheck: userCredentials.email) {
                            print("Email and Passowrd are valid")
                            saveJSON(email: userCredentials.email, password: userCredentials.password, nickname: userCredentials.nickname)
                        } else {
                            print("email address already in the system")
                            self.showAlert1.toggle()
                        }
                    }
                    else {
                        self.showAlert0.toggle()
                    }
                }
                .alert(isPresented: $showAlert1, content: { self.alert1 })
                .alert(isPresented: $showAlert0, content: { self.alert0 })
                .font(.title)
                .buttonStyle(.bordered)
                .frame(width:200, height: 100)

The problem is that you cannot attach more than one alert to the same view and now you have two for your button.

There are several ways to approach this to get only one alert and here I use a simple one where I use a second property that holds an error message that can be used in the alert

@State private var showAlert = false
@State private var errorMessage = ""

if (isValidEmailAddr(strToValidate: userCredentials.email) && isValidPassword(strToVailidate: userCredentials.password)) {
    if !emailDoesExist(emailToCheck: userCredentials.email) {
        saveJSON(email: userCredentials.email, password: userCredentials.password, nickname: userCredentials.nickname)
    } else {
        errorMessage = "Mail already exists"
        self.showAlert.toggle()
    }
} else {
    errorMessage = "Mail or password is incorrect"
    self.showAlert.toggle()
}

Then you would need to adjust the actual .alert modifier but since I don't know what self.alert0/1 are you need to do that yourself (most likely by keeping only one of them and make use of errorMessage).