ERROR: This volume stores external key(s) that can automatically unlock other volumes. Before you can decrypt this volume, ...

ERROR: This volume stores external key(s) that can automatically unlock
other volumes. Before you can decrypt this volume, you must remove such
keys.

ACTIONS REQUIRED:

1. To prevent data loss, check that a recovery password or a recovery key
   exists for associated data volumes.
2. Type "manage-bde -autounlock -ClearAllKeys Volume" to remove stored
   external key(s).