Reproduction Steps:
1. Open a new Unity Project
2. Install the CineMachine Package and its Input System Samples
3. Open the "Split Screen Multiplayer" Scene
4. In the Hierarchy window, select the "HelpUI" GameObject and observe the instructions in the Inspector window
5. Enter Play Mode
6. Attempt to use Mouse (Left Click) and Gamepad(s) (Right trigger) to spawn prefabs and split the camera
7. Observe the Console window and Game View

Expected result: No errors. All prefabs are spawned without issue as per the Instructions
Actual result: "No join action configured on PlayerInputManager but join behavior is set to JoinPlayersWhenJoinActionIsTriggered" error, no prefabs are spawned and the camera isn't split

Reproducible with: 3.0.0-pre.7 (2022.3.5f1, 2023.1.4f1, 2023.2.0a23)
Could not test with: 2.9.7 (2021.3.28f1) (Split Screen Multiplayer scene not available)