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If you use a different client, it will most likely know nothing about the dehydrated certs.
You may be able to get new ones with another client.
As for the "Lock", as I read the error message, the mere presence of the Lock (be it file or folder) signals dehydrated to abort.
Try removing the directory.
But first check that there are no hidden files within it: ls -la /etc/dehydrated/var/Lock