To amend a return I prepared in a prior year on ProSeries.  I can do so in the year the error occured correct--as in 2019?  and it will efile from that year properly? 

Also, Error IND-689-01 it mentions it will not transmit with the wrong date next to the primary signature.  But the signature field is not highlighted except for the preparer prior to transmit.

Do we attach a signed copy by the taxpayer prior to sending the Form 1040X?