Had same problem. followed all instructions for AAF installation (used Vortex) and it worked perfectly. But at some point HOME botton stopped working. Thought it was conflict wth Def_UI mod, reinstalled game, AAF - same. Got the message of AAF and animation pack installed, but no menu pop-up on HOME botton.
Then i just turned the crosshair on in game options and it worked. Guess AAF needs crosshair on for some reason.