Encryption Key Management allows you to Synchronize your existing Encryption Keys Details. These keys are selected from either the Build Template or the Manage. Add New Service while encrypting volumes.
You only have the action Sync Encryption Keys on top right.
When you click on Sync Encryption Keys you will receive this message.
Once done, you will be notified as shown in picture below.
If you click on notification, you will be taken to Service Manager page in Encryption Keys section. (Manage > Service Manager > Encryption Keys)