Hi there @robin927, nice to see you again! In order to sync MyFitnessPal is not require to have a premium account. On that note, keep in mind is not your Zip the one syncing with your MyFitnessPal account, but is your Fitbit Dashboard. So make sure your Zip is successfully syncing with your Dashboard.
If the issue is not related to this and your Zip is syncing, please try these steps to reset the integration between your Dashboard and MFP: Fitbit and MFP not syncing!
Hope this helps and let me know how it goes.
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