Sometimes there can be an issue with the validation between TrainingPeaks and Zwift, so even if it is still connected it would be a good idea to disconnect and reconnect them again to create a fresh connection. You also might want to try scrolling through your list to see if your TrainingPeaks Workouts category didn’t move down the list. The categories aren’t sorted as absolute as you might expect and it can sometimes show up at different places on the list depending on your device