How do I enable shipping options on Shopee?
To do that you’ll need to go into the "Shipping Setting" section of the Shopee Seller Center and make sure that at least one of the options on the right is enabled
There is more information here https://help.shopee.com.my/my/s/article/How-do-I-set-shipping-options-for-my-shop-1542971592270
Additional notes:
Once you've updated your shipping settings on Shopee, please check the app's Shopee settings on Shopify to see if you have a default shipping option enabled: