Hello,
Welcome to Microsoft Q&A!
How can I fix the error?
Please modify the description or the content inside your app. It is not recommended to say this is a demo, or anything related to test.
Where does the assumption that this is a test app come from?
We don't know the description or content that you are using in your app, you have to check it by yourself. There might be some description that you are using will lead misunderstanding.
Thank you.
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