Hi,
What version of Office did you use?
As the article said the function is currently available to Beta Channel users running:
- Windows: Version 2312 (Build 17116.10000) or later
- Mac: 16.80 (Build 23111917) or later
https://insider.microsoft365.com/en-us/blog/new-aggregation-functions-in-excel-groupby-and-pivotby
You can try to join the Microsoft 365 Insider Program to get the function:
https://insider.microsoft365.com/en-us/join/windows
Hope the information is helpful.
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