When a DXP or Portal instance is shut down and no longer in use, Administrators can free up that subscription slot by deactivating the activation keys on their respective Product Activation page.
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From your project page on support.liferay.com, click Product Activation > [Product Type, such as DXP].
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Locate the key in the list.
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Select the key(s) you would like to deactivate and click the checkbox next to the key(s).
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Click the "Deactivate" button that appears in the upper right.
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A confirmation message will pop up asking for your confirmation before deactivation occurs.
Once the key is deactivated, it will no longer be listed in the Activation Keys table.