Sharing app with private tables

I’ve made an app where every table lives in its own worksheet, and all have sharing turned off. There is no data in any of the tables. Authenitcation Provider is set to Any Provider. I’ve shared it with two people to test. One has an Android phone and uses Google and there is no issue. The other has an Iphone and uses Dropbox and the app will not load. The first error message says" The app did not load successfully. Net work Error please check connectivity. However the user can then go to shared apps and see the app listed but on trying to access it gets a further error message: Unable to fetch app definition referring to one of the spreadsheets and sheet within it. On checking the app definition, all seems in order so I can so no reason for the error. Does anyone have any suggestions? The app is in Deployed status on a Premium subscription.
Thanks in advance
Marlene

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