Delete Signing Keys
warning
Deleting a signing key cannot be undone! Any JSON Web Tokens that were signed using the key will not work anymore.
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Select the "Settings" option in the Bitstreams, located on the left hand side.

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The Settings interface is now shown, click the Credentials tab, then find the Signing Keys section.

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Find the signing key ID that needs to be deleted.
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Click the red trash can icon to the right of the access token, under the Action column, to permanently delete it.
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A confirmation window will popup:

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Press Confirm to finish deleting the access token.