Turbotax won't let me re-efile a rejected amended return

I just used Turbo Tax to e-file an amended return for 2021 but it was rejected. Now Turbo Tax won't let me e-file again with the fixes. It only gives me the option to mail. Why? I was able to e-file the amended return on the first try. Why won't it let me try again the same way? It was a very small correction I needed to make.