Request for advice for malfunctions with the Lambda function

Hello everybody,

Two questions about the Lambda function.
1>Are there any reserved names?
I cannot validate my function if it has the name Combinations (a name not used in workbook by function or in the name manager).

(in a new workbook)

2>Sometimes my Lambda functions are in #Name and I have to revalidate in the name manager.

Revalidate formula in cell or shortcuts like F9, Ctrl+F9, Shift +F9, Ctrl+ Shift +F9, Ctrl + Alt + F9, Ctrl+ Shift + Alt + F9, not working

How to fix this behavior?

Thanks 

Hecatonchire

My Excel :  
French Microsoft® Excel® pour Microsoft 365 MSO (Version 2306 Build 16.0.16505.20000) 64 bits (beta) Windows  11 / 22H2 / 22621.1702