Herein lies my narrative regarding the 'incorrect blade.'
The 2008 SL 63 AMG that I maintain for a friend experienced the same problem. It is a car with exceptionally low mileage, with my friend serving as the third owner.
The vehicle was purchased new by a regional entrepreneur for his spouse (can you believe it? sexist, right?) and subsequently sold to my friend's close acquaintance and business partner after being stored for several years; he transferred it to my friend to accommodate his new Ferrari and insisted that my friend promise to offer him the first opportunity should it be available for sale again.
Thus far, it has been rather tedious.
Throughout the process of restoring the car to optimal condition, I observed that one of the key fobs was nonfunctional; despite acquiring new batteries, it remained ineffective. In summary, the key fob and blade were significantly associated with this two-owner vehicle from new.
It remains entirely enigmatic; I can merely speculate that a misunderstanding occurred during one of the vehicle's four MB dealership services. Neither the initial nor the subsequent proprietor possessed another Mercedes-Benz, thus the amalgamation of key fobs in the communal bowl at a partner exchange gathering was irrelevant.