When using PGP Command Line to remove signatures from a key using --remove-sig, if the key is specified using the KeyID the operation will fail.
<Key ID>:remove signature (3018:user ID not found)
To workaround this issue, specify the key using the UserID of the key rather than the KeyID.
Symantec Corporation is committed to product quality and satisfied customers. This issue is currently being considered by Symantec Corporation to be addressed in a forthcoming version or Maintenance Pack of the product. Please be sure to refer back to this document periodically as any changes to the status of the issue will be reflected here.