Google Play App Signing

So I have an appsheet app on the Google Play store, that’s been there for awhile. However, they are threatening to take it off if I don’t add a new release. So I generated a new release and am trying to upload it but it says I need to enable app signing. Then I went through an elaborate process to do app signing that ended in not being able to get a private key. I asked Gemini and it says Appsheet should supply that. Does anyone have any experience with this?

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