Minecraft version 1.19.21 is now available on Nintendo Switch and players should once again be able to join others through cross-platform multiplayer. Thanks for your patience while we worked to resolve the issue. -MG

I can't done world replacing because of this error. Why is that??? I already tried too many times.

Sorry to hear that you've run into this issue! If you could, can you let us know what troubleshooting you've tried so far? ^BT

Yeah got kicked out of my realm for playing like a hour or two and it didn’t save anything when I got back on have to build it all over

That sounds like somewhere there was a connection interruption and this took place. Are you playing on WiFi by any chance? This can be a huge culprit but third party programs as well. ^TK

Two more people that were playing with me got kicked as well it saved when one of my buddies died he had to go get his stuff again