If by “here” you mean this forum, it has nothing to do with product registration. One doesn’t even need to have a Canon product to register for the forum.
Along with NatalyaP's recommendation to try a different cable, be sure the cable you are using is a HighSpeed USB-C 3.1 Gen 1 compatible cable. I had connection issues with my 1D X Mark III until I started using a HighSpeed cable.
