Form 1116 Schedule B error message for 2021 amended return

I received a corrected 1099-DIV today and need to amend my 2021 return.  I tried to e-file and received the following error message:

 

We can't e-file your return because we're unable to locate the attachment at /attachment/Form1116ScheduleB.pdf.  Please go back and re-attach it.  Then try e-filing again.

 

When I look at my saved PDF, the form is there.  Why doesn't TurboTax recognize it on the amended return when it recognized it on my original return?