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Welcome to the Fitbit community, @Morten57!
Unfortunately I don't speak Norwegian. Concerning your issue with heart rate tracking on your Charge 5 you should have a closer look here:
What factors can affect my heart-rate reading on my Fitbit device?
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Velkommen til Fitbit-fellesskapet, @Morten57!
Jeg snakker dessverre ikke norsk. Når det gjelder problemet med pulssporing på Charge 5, bør du se nærmere på lenken jeg har gitt ovenfor.