When setting autoEncryption.encryptedFieldsMap in the bundle configuration, the keyId is required. It must be a BSON Binary UUID.

• The bundle configuration must accept the keyId, and convert the value into BSON Binary UUID.
• The command "doctrine:mongodb:dump-encrypted-fields-map" must dump the UUID (which seems impossible from the metadata).

We can use altKeyName when creating the key, and use it in the encryptedFieldMap configuration. Then we have to instantiate a MongoDB\Driver\Manager, to create a ClientEncryption and retrieve every keys in order to generate the driver options to create the MongoDB Client.