Error in perform a function

Hi,
Im trying to start a scenario with make_function
I have the extension installed and have put the webhook inside the sheet
I always have this same message
SyntaxError: Unexpected token ‘A’, “Accepted” is not valid JSON (ligne 50).
See my screen copy and how i have set the formula for test purpose
same with =MAKE_FUNCTION( F6 )
Thx