Please use the following segment filters when selecting customers who have opted in to email and/or push notifications
Email Subscription Status is 'Opted In'
Push Subscription Status is 'Opted In'
See https://www.braze.com/docs/user_guide/message_building_by_channel/email/managing_user_subscriptions and https://www.braze.com/docs/user_guide/message_building_by_channel/push/users_and_subscriptions for further information
The subscription status of a customer can be checked under the Engagement tab of the User profile page