I have followed these exact steps.
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Go to https://marketplace.zoom.us and sign in.
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Click "Manage" in the top right corner.
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Under "Personal App Management," click "Created Apps."
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Find your JWT App by looking at the "Type" column.
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Click "Activation" on the left.
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Then click "Activate your App" and confirm it.
That is when I get the error owner_removed, when I try to Activate my App.