Field Level Encrypted Email Addresses within Journey Builder

When using FLE, Journey Builder can register the encrypted value as an Email Address by using the below configuration:

• In order for Journey Builder to send to an encrypted Email field you will need to create a 'Population' where the encrypted value can be held. 
• The Population should serve as the main system of record within Marketing Cloud for your records. This way anyone passing through a Journey will already exist here, and have an encrypted value which can be sent to. 
• The relationship for your Population should be based on the value which you would like to be your Subscriberkey (interchangeable with ContactKey). This will need to be a primary key. 
• The data extension which is being used as your Population will need to have the 'Encrypted' field setting on the email address field. 
• Then you are able to select the email address field from this Population through the 'Default Email Address' option in Journey Builder Settings.