I'd say the OP's formula is using a "<" symbol.
If the "<" is preceeded / followed by a space, it will treat it as HTML and the rest of the formula will not appear.
The < symbol (followed by a letter btw for rest of the formula to vanish) and the full formula normally show up if I do a reply with quote (because I am in WYSIWYG mode) and doesn't in either of the OP's posts.
Just testing below to make sure that nothing has changed in this thread.
=IF(A1<B1,"X","Y")
Edit:
Yes, I can still see the full formula above in reply with quote but not in the OP's posts.
I re-formatted to column headers on Table1 to "General" and removed a space in the "Days Past Due" header and it worked. I still do not understand because it was working until the IFERROR was added.
=IFERROR(AVERAGEIF(Table1[Customer '#],'Customer Summary'!$A$2:$A$50000,Table1[Days Past Due]),"0")
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