With the completion of T145915, we should properly enable this functionality within Wikimedia production:
- Set OATHSecretKey on the beta cluster.
- Wait for Jenkins to deploy this.
- Run UpdateSecretsToEncryptedFormat.php to migrate older oathauth_devices data on the beta cluster.
- Set OATHSecretKey within PrivateSettings.php within Wikimedia production.
- Run UpdateSecretsToEncryptedFormat.php to migrate older oathauth_devices data within Wikimedia production.