The details in this article will help you with the following:
Attempting to download the game or enter the Nintendo eShop on the Nintendo Switch, the error code 2137-8056 will be shown.
You will receive the error message “Unable to communicate with the server. The network may be busy or the signal strength may be poor. Please try again later.”
Review.nintendo.com / networkstatus support for the most up-to – date maintenance and server status statistics.
If the error continues and there is no note of maintenance of Nintendo eShop, try again at a later time.
Ensure that your console has the latest system update.
If the console is up to date, restart it by holding down the POWER button for three seconds, then pick Power Options followed by Restart.
Power duration of your home network.
Restarting your network devices can resolve this issue if it relates to non-responsive devices.
Manually enter an alternative DNS.
If the DNS you are trying to use is not running, this issue can be fixed by entering an alternative DNS.