Switch update out now (version 10.0.4)

The newest firmware for Nintendo Switch is out now (version 10.0.4). This update fixes an issue which was preventing users in certain regions from registering credit card information on their accounts to purchase things on the eShop. 

This is seemingly the only feature of this new update, but feel free to check out the full patch notes below:

Ver. 10.0.4 (Released June 4, 2020)
Fixed the following issue:
We have fixed the issue where it was not possible in some countries or regions to add funds using a new credit card or to register credit card information in Nintendo eShop on Nintendo Switch.

Source