Do you have independent rudder pedals?   Are they configured properly?  Make sure everything is calibrated and working properly both in MSFS menu and the Fenix FMC.  Good luck

Edited July 5, 20241 yr by Tony P

Submit a ticket to Fenix

I run into this issue as well with the Fenix.  I sometimes need to move the throttles almost to take Flex Take-Off just to get it to taxi then it starts to move is so frustrating. Like the OP said, I don't remember having any issues with the Fly-By Wire A320N I don't think.  I haven't flown the  A320N in a while but will soon just to see if it does it too.

Which pushback are you using with the Fenix, it sounds like, it is not disconnecting the Tug. 

I tried all the suggestions since my last response.

Killed Couatl in case it was a GSX conflict.

Used both Fenix's pushback and MSFS' Shift+P pushback to try and get the plane unstuck. Pushback works fine, plane refuses to move forward under its own power.

Reinstalled it completely from scratch.

Filed a ticket with Fenix support, all they had to suggest so far is "create a new controller config for your throttle", ignoring the fact that I can't get the plane moving even with my throttle controller disconnected.

Sorry to read that.
Let's see..

1/ Sometimes, a simple mod in the Community folder can cause very strange effects.
Have you tried with an empty Com folder?

2/ Have you checked that the following folders were deleted before reinstalling?
C:\ProgramData\Fenix
C:\Program Files\FenixSim A320

3/ Does it happen in different airports? Have you tried another liner in the same departure conditions and location?