Garmin connect does not synchronize the swimming workouts set in Trainingpeaks. Other cycling and running trainings are being transferred and can be switched on. I am asking for help in solving the problem.
Yes, that's correct. It is apparently a bug. See also this thread:
https://forums.garmin.com/apps-software/mobile-apps-web/f/garmin-connect-web/163824/why-are-swim-workouts-not-supported-in-the-api