iOs Testflight App not working


After submitting my app in Adalo for Testflight (I followed the manual by Adalo) I got an email from Apple: “App Store Connect: Your app “XXX” (Apple ID: xxx Version: xx has one or more issues” It also says: “Missing or invalid signature - The bundle ‘xxx’ at bundle path ‘Payload/xxx’ is not signed using an Apple submission certificate.” I thought that Adalo does everything automatically, so why would I have to use the Apple submission certificate?
So I‘m having some trouble with this, does anyone know what the problem is and how to solve it? Thanks in advance. Looking forward to reading your responses!

Best regards,

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