AVERAGE reduced lambda on GROUPBY or BYROW formulas not working on specific workbook.

Currently using excel with spanish formulas. When using GROUPBY formula, i can use SUM, PRODUCT, LAMBDA, however AVERAGE (PROMEDIO) won't work on a specific workbook which previously has a lot of GROUPBYs that work properly.

When I update the previously working formula, it now returns NAME error and PROMEDIO turns into Promedio.

Inserting the function looks like this:

I have no custom name called Promedio. This same GROUPBY formula works in different workbooks.

Help would be appreciated. Best regards