Question about SanDisk Nintendo Switch Card

Normal microSD cards can also be used for the Switch; they do not have to be a special Nintendo Switch microSD. A normal microSD is also much cheaper.

I would check whether the microSD card can be read on a computer, for example, if possible, or otherwise just return it and buy another card, e.g. this one also works:

Transcend High Endurance (microSDXC, 256 GB, U3, UHS-I)