Can't get into Realms on Minecraft: Java Edition? Due to GDPR (http://minecraft.net/privacy/gdpr/ ) users under the age of 16 need parental consent to play on Realms. To set up parental consent on an account, visit http://minecraft.net/update-account .
When only the demo mode is accessible or it's asking you to pay again, this means that you're logging in with an account that doesn't contain a Minecraft profile/username or a copy of the game. please visit https://help.minecraft.net/hc/en-us/articles/360029643892-Can-only-play-Minecraft-demo-Java-Edition- … for possible solutions. ^AS