The following types of microSD cards are supported on Nintendo Switch:
microSD (up to 2 GB)
microSDHC (4 GB - 32 GB)
microSDXC (64 GB and above)
Important: In order to use a microSDXC card on the Nintendo Switch console, a system update is required.
In order to improve your gameplay experience, using a microSD card with a higher transfer speed is recommended.
High-speed microSD card guidelines:
UHS-I (Ultra High Speed Phase I) compatible
Transfer speed 60 - 95 MB/sec (the higher the transfer speed, the better gameplay experience on Nintendo Switch)