Hi, I somehow lost permissions for my TARDIS in singleplayer creative and now it won't let me in. I saw a previous thread that said to look at the exterior of the TARDIS and use the command /dalek-mod tardis addself but it's not working for me.

EDIT: I think I know what caused it. I had to delete minecraft and reinstall and I didn't realize I was playing in DEMO mode when I first created the TARDIS and it gave ownership to the name "Player". I had to email mojang to get the full version back and when my account was reactivated my player named changed back to "ANTI_TWIN". Now my TARDIS doesn't recognize me. What can I do to fix this?

I think you need to open Minecraft Demo again and add yourself as a companion. Then you can enter the TARDIS with your normal minecraft account.

Sounds legit, thanks! How do I play again in demo mode? I'm not seeing a way to open the game in demo mode now.