Hi Julian. For some reason I can´t get fully async, I mean, UI is mostly blocked and any loading spinner either freeze or don't show at all. Commenting your las code for clarity: [RelayCommand] private async Task PrintAddressAsync() { //UI is blocked and IsRunning is false if (Copies < 1) return; //This line releases the UI, IsRunning sets to true and it shows the loading spinner await Task.Delay(TimeSpan.FromSeconds(2)); //Now, the UI is blocked again and the spinner is frozen OnPrintAddress?.Invoke(FullAddress); } The only way to get really async is wrapping everything in Task.Run. Any thoughts?