Hello @tysoKitten, nice to see you have joined the Fitbit Community! I was reading your swim exercise is syncing fine with your Fitbit app but is not syncing with MyFitnessPal after you connected this to your Dashboard.
Keep in mind the way this integration works, is that Fitbit steps and sleep data can be viewed in the "check-in" section of MFP. However, exercises logged with your tracker won't be synced. Different from exercises logged in MFP, as this indeed, will appear in your Dashboard as manually log activities.
For more details, please refer to this post: Third Party Apps - Informational Post.
Hope this helps and let me know if you have other questions.
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