Further to my question above:

The IRS letter (Notice CP318) states:  After reviewing your submission, we can't process your Trump account election due to the following reason:  Your election was missing information, hard to read, or had illegible information.

The Form 4547 was filed with the return, the ERO kept the 8879-TA as instructed.  There does not appear to be any missing information.  All information on the form was typed per ProSeries input.  

Not sure how to respond to the IRS, except to send another form 4547.

This potentially affects numerous returns.