I gave some morphs some keybinds so I can quickly turn into them whenever I need to, but when I click the key, nothing happens. Using . to demorph works, but not any other keybinds. I'm on Minecraft 1.12.2 using Metamorph 1.2.2. None of the keybinds in controls for Metamorph are red. I'm playing survival singleplayer, normal difficulty. Any way to fix this?

Everything works for me, so I would suggest trying only with Metamorph and McLib. If it works with Metamorph and McLib only, then I suppose some other mod is hinders with keyboard input.

I can repro this. The workaround appears to be opening the creative morphs GUI. A survival keybind bugfix is a work in progress in the Changeling development code.