We are developing a public app which has been rejected once. But our app become unsupported so that we can't even test our app now. What should we do to update it? By the way, we have updated api version we used.
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I think you can install app in development store and test there.
You can create development store from your partner account if you don't have any.
It will automatically removed step by step.
Tomorrow you'll see like attached screenshot. and then after 7 days and so
This is an accepted solution.