Breakaway Workout names integration with Garmin

I’m not sure what that means.

some search on intervals.icu forums

Seems like MaxEffort is a Zwift construct and is only techncally recognised by Zwift. Not sure what Zwift sends to the trainer.

For Max Efforts, I would suggest that you run the workouts in ERG+SLOPE mode.

Use a High Slope % for the max effort intervals and you should be good to go.