Welcome to the Forums @Johannahmiller.
I'm not able to see this app as an officially supported integration. This doesn't mean it won't work but it means we are not aware of the data it will share with Fitbit or if there is an issue with the integration.
My recommendation is to revoke the access of Noom from your Fitbit by accessing on your Application settings. One you have revoke the access try to reconnect the third party service again to refresh the integration.
Let me know if there is anything else that I can help you with.
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