Need to file 1040-x for my 2021 federal tax return

Hello - I called IRS today and they told me the 1040-x is available already to amend my 2021 1040 tax return (I filed too quickly and had some mistakes).  Yet when I tried to do so via turbotsx the program says that IRS has not yet provided the form.  So either IRS is not giving me the right info or turbo tax is not.  I really would prefer not to wait until Feb. 24th or later to correct my form (which was 'accepted' by IRS on January 24).  Please let me know if I can e-file my 1040-x now (I do not want to do a paper mail-in filing).