Erg not kicking in during high level FTP workout

Any one have a suggestion for a newish Tacx Neo that isn’t adjusting difficulty during FTP training sessions?

Can be in big ring, smallest cog and not get enough resistance to generate power for the workout.

Seems to have stopped working mid-workout.

Likely on Neo side or app side? Running Zwift desktop on a MBP.

If it stopped mid-workout, perhaps you lost signal or it was a glitch/bug. Did you accidentally disable ERG via the Companion app while doing the workout?