Hi there @KarinaNicolini, great to have you here in the Fitbit Community!
Note that at this time the Fitbit Community and Customer Support isn't staffed to provide service in Dutch. We'll be happy to assist you in English, Spanish, German, French, Korean, Mandarin, Italian or Japanese and hope to support more languages in the future!
In the meantime, I was able to understand that your tracker is not syncing with your phone, so give it a try to these help article: Why won't my Fitbit device sync?
See you around.
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