I have posted this in Test Patch as well, but it might be a general issue.

I had to contact Logitech about my G27 because of calibration issues and they "upgraded" me to a G29. However when I try using it in LFS I can't get FFB to work. LFS reports:

"CreateEffect failed (0 axes)"
"Could not setup FF steer device"

I've tried using both device 1 and 2 for the FF device and the G29 is listed first on the controller list so I'd expect 1 to be the proper device, but doesn't work.

The FFB of the G29 works as expected in iRacing.