List of third party apps empty in the app

[Freakybeanie]

My list of third party authorised apps is empty despite having a few working well. 
just trying to update it and there are no apps showing to interact with! 

Moderator edit: subject for clarity 

[LiliyaFitbit]

Welcome to the Fitbit Community, @Freakybeanie.

Thanks for the details shared in your post. I understand how you are feeling and recommend doing the following:

1. Log out from the Fitbit app.
2. Verify if the Fitbit app is updated to the latest version. For instructions, see this help article.
3. Force quit the Fitbit app.
4. Reboot your phone.
5. Open the Fitbit app and log back in to your account.

You can confirm the steps to connect your Fitbit account with another app in How do I connect my Fitbit account with another app? 

By the way, I've moved your post to the iOS App board so we can keep our forums organized.

Hope this helps.