Form 7004 extension for an 1120S was rejected. Where do I find the reject code/reason?

"IR-2020-66, April 9, 2020

WASHINGTON — To help taxpayers, the Department of Treasury and the Internal Revenue Service announced today that Notice 2020-23 (PDF) extends additional key tax deadlines for individuals and businesses.

Last month, the IRS announced that taxpayers generally have until July 15, 2020, to file and pay federal income taxes originally due on April 15. No late-filing penalty, late-payment penalty or interest will be due.

Today’s notice expands this relief to additional returns, tax payments and other actions. As a result, the extensions generally now apply to all taxpayers that have a filing or payment deadline falling on or after April 1, 2020, and before July 15, 2020. Individuals, trusts, estates, corporations and other non-corporate tax filers qualify for the extra time. This means that anyone, including Americans who live and work abroad, can now wait until July 15 to file their 2019 federal income tax return and pay any tax due."

The window opened April 1. Before that, you were supposed to stay on schedule as usual.

I have filed many other 7004 extensions in the last two days and all have been accepted except for this one.

The reject reason:  "Form 7004, the application for extension can only be filed after the Tax Period End Date and on or before the due date of the return to which the extension applies as specified in the Form 7004 Data Charts in Publication 4164."