Won't let me join friends worlds and Realms without taking forever in Bedrock Minecraft.

Before I used to be able to get on the bedrock version of Minecraft and just join a friends world or Realm when I try to load in know it says, “World Failed to Load Unable to connect to the World.” I have a stable internet and have done the things to try to reset it and it never worked. I’ve tried reinstalling the game. I seen a report on something like this saying that when he went into the game file nothing was there. I am also having the same problem. I go into the files to find my worlds to copy it to a hard drive to be able to use the world on my other computer (via /User > appdata > local > Packages > Microsoft .MinecraftUWP_8wekyb3d8bbwe > Localstate) and I find nothing besides bootstrap Storage. I also can’t see my player skin and sometimes can’t even get into the Marketplace on Minecraft.