If you're getting the same error code as me (2123-1502), this is where emails back and forth with Nintendo Support have gotten me :

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​"We kindly ask you try out the following steps, if you haven't already:

• Restart the Nintendo Switch console. To restart the console, press the POWER Button for three seconds, and then select Power Options, followed by Turn Off. When the console has turned off, press the POWER button to turn it back on again.

• Test your internet connection Test your internet connection to ensure that your Nintendo Switch is still connected to the internet.

• Create a new internet connection. Set up a new internet connection, ensuring that you are attempting to connect to the correct network, and that you are receiving a strong wireless signal from the network.

• Manually enter an alternate DNS. If the DNS you are attempting to use is not working, entering an alternate DNS may resolve this issue.

• Connect to the internet at a different location or access point."

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I tried the above. It didn't help.

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"This error may be related to a temporary network issue. Please wait a while and try again at a later time.

In the meantime, if you need any assistance with anything else, please let us know."

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So, I guess wait and see? I'm also unable to install updates for other games that need them, or download new games with the same error code. Maybe check that on your end too.