HomePage.xaml.cs

public partial class HomePage : TabbedPage, IStartupTask
{
    public HomePage()
    {
        InitializeComponent();
    }
    public Task<bool> CanRunAsync() => Task.FromResult(true);

    public async Task<IStartupTaskParameters> RunAsync(IStartupTaskParameters parameters)
    {
        if (parameters.TryGetValue("Name", out var name))
        {
            await App.Current.MainPage.DisplayAlert("Welcome!", name?.ToString(), "Ok");
        }

        await App.Current.MainPage.Navigation.PushModalAsync(this);

        return StartupTaskParameters.None;
    }
}