I have had no problem with my Forerunner 965 so far, but last Saturday the data from a Triathlon workout, which are perfectly stored in the history on the watch, do not transfer to Garmin Connect Mobile. Please help.
I can't tell you,why the Triathlon is not synced to Garmin Connect. However you can do that manualy. First connect your watch to your PC. Than navigate in the file explorer to the folder "Garmin" -> "Activities". You will see a lot of activities (as "*fit" files.). Mark and copy themultisport activity of your triathlon an copyit to your PC. Now open Garmin Connect on your PC (Internet Browser: https://connect.garmin.com/) and login. Once you arel ogged in, you will find a symbol "cloud with an arrow" at the upper right. Click here. You now can upload the file you copiedfrom your watch. That's it.
As MarkusD already mentioned, I'd first try a manual upload to Garmin Connect Web - How Do I Manually Upload an Activity I Recorded to Garmin Connect?
If you get any message other than Import Complete, then there is a problem with the file. In that case, please attach it to this thread. We can take a look to see if it is repairable.
Is it possible that this forum is really buggy? I received an e-mail that someone has mentioned me in a forum post (the post below). But this account (MarkusD) has not posted the message above) (seems to be that multiple accounts can have the same Username?!?)
seems to be that multiple accounts can have the same Username
It would appear so, but they are actually different usernames.

I tagged the wrong MarkusD. Sorry about that.
This will work - 2023-05-27-16-00-06-fixed.fit
Congrats on the tri!
I've got the same issue with my file from today and went through the manual upload as well. Could I get your help as well?
This will work - 2023-06-11-07-57-52-fixed.fit