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[Input System] Player prefabs are not instantiated on Join Action when they have InputActionAsset assigned to them

Package: Input System


Reproduction steps:
1. Open the attached project ("")
2. Open the repro scene ("SampleScene")
3. Enter Play Mode
4. Press left mouse button and space bar
5. Notice that two prefabs get instantiated
6. Exit Play Mode
7. Assign "DefaultInput" InputActionAsset to Player prefab's Player Input component
8. Enter Play Mode and try to spawn them again

Expected result: Player prefabs are spawned when triggering Join Action
Actual result: Player prefabs are not spawned

Reproducible with: 2019.4.9f1, 2020.1.3f1, 2020.2.0a21
Couldn't test with 2018.4 (minimal package version not supported)
Reproducible with package versions: 1.0.0-preview.5, 1.0.0
Not reproducible with package versions: 0.9.0-preview, 1.0.0-preview.4

Note: The issue does not reproduce when using "SimpleMultiplayer" InputActionAsset from "Simple Multiplayer" sample

  1. Resolution Note:

    The problem here was that the input action asset in use had no required devices in it's control schemes, so the PlayerInput component was not able to assign a device to the player. Added some validation messages both in the debug log and to the PlayerInputManager inspector window to make it clearer when this is an issue.

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