I don't know what happened but, After logging in through my Minecraft Dungeons. A text popped up and suddenly saying that "Unable to verify game ownership" so I tried to relaunched  the game for the second time, and it still said that text again. Then, I decided to Uninstall the game and install it back up again. And finally it worked, but then my current data got reset back to level 1. I don't know what happened, But please fix my data and restore it.