When I export/download a Google Sheet containing cells with the IFNA() formula to Excel, I get #name? errors in those cells when opening the file in Excel (Excel for Mac version 16.32). Strangely enough, when I just enter the cell in Excel to edit and press return (without any changes made or visible), the error disappears and the formule works as expected.
I've tried copy&pasting the formula into the same cell in Excel and several other attempts to somehow force re-evaluation or recalculation but that doesn't solve the problem. Also strangely enough, when opening the file in Libreoffice some cells don't show this error and other do with no visible difference why.
I did notice that the IFNA() function in Excel has 2 mandatory arguments, while in Google Sheet the second argument is optional. As I have 2 arguments everywhere, it should not be a problem.
Just for reference, the formule is as follows:
=IFNA(-VLOOKUP($B5;Othersheet!$A:$N;MONTH(C$2)+1;0);0)
Where $B5 contains a text value that is used in the VLOOKUP formula and C$S a date that is used to determine the column number for the VLOOKUP value, looking up a value in a matrix on another sheet. The VLOOKUP formule should not be the problem as it works perfectly when re-entering the same formule without any changes directly in the cell in Excel.