I’m stuck where I need to go to admiral in castle suite. I can’t enter courtyard from pool patio..

Tap the check mark at the top to see what the next objective is (Q or Admiral). Then check the phone. Look at the map for the ! which should tell you which room you need to get to.

If you cannot get to the room for the objective then there maybe a glitch. Try restarting the app, if that doesn't help then you may need to report it to the game support.