So I have a potential workaround.
Try archiving the Minecraft software on your Nintendo Switch device. Download the software again then re-attempt to play your world on realms. Has worked for me, with the world being available to play on both Switch and Windows 10.
So I have a potential workaround.
Try archiving the Minecraft software on your Nintendo Switch device. Download the software again then re-attempt to play your world on realms. Has worked for me, with the world being available to play on both Switch and Windows 10.