Promotion coupon code not available on checkout steps

I want to show the promotion coupon code throughout the checkout steps. The variable is not available when I do a dump of the order vars in twig. While it is available on the cart. See dumps of cart and order below:

Cart:
#promotionCoupon: [Proxies_CG_\App\Entity\Promotion\PromotionCoupon]
#isInitialized__: true
#perCustomerUsageLimit: 1
#reusableFromCancelledOrders: true
#id: 1
#code: “ABCDEF123456”
#usageLimit: 999999
#used: 0
#expiresAt: DateTime @1603490400
#createdAt: DateTime @1602326335
#updatedAt: DateTime @1602326335

Order:
#promotionCoupon: [Proxies_CG_\App\Entity\Promotion\PromotionCoupon]
#isInitialized__: false
#perCustomerUsageLimit: null
#reusableFromCancelledOrders: true
#id: 1
#code: null
#usageLimit: null
#used: 0
#expiresAt: null
#createdAt: null
#updatedAt: null

Total prices are calculated well, so it seems the promotion is applied correctly.

Anyone?