Please follow these steps to troubleshoot the app on your iPhone:
1. Delete the Allurion app from your phone
2. Restart your phone
3. Reinstall the app from the App Store
4. Open the app, navigate to "sign in using an existing account"
5. Please check that your iPhone has sufficient storage space for the app to work. Open the settings on your phone > General > iPhone Storage > see the total storage available on the phone and scroll down to see the storage of the Allurion app.
***Please note, you will not lose any of your data if you delete the app as it is saved to your User Account. Once you log into your account, the previous data will populate.