I have an issue with re-submitting an amended federal return.

I e-filed a 2020 amended Form 1040X for a client whose return I had e-filed and accepted last year. 

The first e-file went well except that it was rejected due to error in taxpayer's signature date.   I corrected the error and tried to re-submit.  This time, the e-file status for the federal amended return said not ready and the reason given was Federal return not completed.

Has anyone had this issue before?