How do I play minecraft bedrock pc with nintendo switch without nintendo online membership?

Hi JuanCastro_013! My name is Ricardo an independent advisor ready to help you with this situation!

This would be a question for Nintendo support, but I can say that Lan games are only among the same device, you can't do cross-platform lan

Have you an active Nintendo Switch Online Subscription? I ask this because I found the following Q/A on Minecraft Nintendo Switch FAQ:

Can I play Realms on this edition?

Yes, Realms is available on the Bedrock edition of Minecraft for Nintendo Switch. To play online on a Nintendo Switch, you need to have a Nintendo Switch Online subscription, so this is a requirement for playing on Realms. More information about Nintendo Switch Online can be found here.

Furthermore, can you post the entire error message (better a screenshot/photo)?

Hi, I hope you're doing great out there. I am an Independent advisor and I am here to help you in regard to your concern.

Just a friendly reminder though that the Minecraft license on PC which is Minecraft for Windows (Bedrock) is different from the game license on Nintendo Switch.

This means that if you would like to install and play the game on your Nintendo switch, you may need to purchase the game on your Nintendo shop.

To play online, you'll need xbox gold membership. For the Minecraft version i think you'll need the bedrock editon (which is the one for Xbox, windows 10 and Nintendo switch that just have "Minecraft" in the title (it doesn't say bedrock edition)) and
to join a realm you need to get an invite from the person that has created the realm

Thank you for your time, I play bedrock Minecraft on my Nintendo switch lite.