@MojangSupport I’m playing on a realm that I just purchased last night, this was my second one in a month hoping that buying a new realm would fix the world export issue and it didn’t. The last realm I purchased was for 10 players, replacing the realm with any world always fails.
Please check our FAQ at https://help.minecraft.net/hc/en-us/sections/360004954931-Minecraft-Realms …. If you still require assistance with your Realm, please send us an email at https://help.minecraft.net/hc/en-us/requests/new … and we will assist. Remember to describe the issue, provide the name of the Realm, and your Username/Gamertag. ^JS