Restoring Authorized Keys
You can use Key Manager to restore deleted or missing authorized keys.. This example demonstrates how to restore the authorized key that was removed in Removing Keys.
To restore an authorized key, go to the User keys→Authorized keys page. Find a key entry that is marked as removed (indicated by a 
icon). Then, perform a Restore action on it.
Key Manager starts jobs for restoring the selected key. While the jobs are running, the authorized key is marked with a small clock icon.
Since restoring a key changes its status, you may need to remove or adjust your filters to see the key entry.
Wait a moment for the jobs to finish, then refresh the page. If the clock icon has disappeared, the restore jobs have finished, and the target key is once again usable..
Once again, you may run ssh as the source user to verify that the authorized key is restored and usable (you should be able to log in without a password prompt):
$ ssh charlie@bilberry.example.com