I am using the modern. So sounds like it will eventually sync. My morning run synced fine, but noticed it was slow. In the afternoon the swim was the issue around 5PM CST. So Garmin servers are kinda like the pool is around the new year. Last week the pool was just me. This week sharing a lane. I may try classic if it doesn’t sync. I noticed issues syncing to other apps yesterday including Myfitnesspal. I think everyone was experiencing server overload yesterday.