Keep the expired app on your device until a final update is released for the old bundle ID, which will remain valid for 3 months. Once the update is available, download it, restart the app, and proceed to transfer funds.
If you wish to continue using the app, either download it from the App Store or use the new beta version from the updated TestFlight link.
https://www.enuts.cash/get-started#download
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For those who see the TestFlight message 'beta app has expired'