It is currently not possible to play the same Bunny Haven account on more than one device unless you are linked to Apple ID. However, if you need to move your Haven from one device to another please get in touch with our Support team so they can move your game for you!
When playing across multiple devices you should make sure to wait at least 20 seconds after completing in-game actions and leaving the game. Then you should force quit Bunny Haven on the device you were playing on first before opening it on another device.