I would like to know the font of the M6 (Métropole 6) channel in France.

This is not a typeface, the logo was created from scratch by the graphic designer Etienne Robial, as you can see in this photo https://twitter.com/valentinsocha/status/1301784569021116416

Ça alors, je savais que c'était Etienne Robial pour le premier logo génial de Canal+ (avec l'ellipse) mais pas du tout pour M6 !