If you get DirectX Out of memory, Direct3D could not allocate sufficient memory to complete the call error, follow the solutions mentioned in this post.

To fix that, you'll want to know how to allocate more RAM to Minecraft. It's important to note initially that, thanks to the many Minecraft Java vs Bedrock differences, this only applies to the ...

This post shows a few possible solutions to deal with the Minecraft failed attempt to join realm error on Windows 10.