I am facing same issue, I am building shopify product subscription extension using newly launched subscription API. I have beta access for the store and app both. I have created the selling plans and added the code to the theme files by referring this documentation https://shopify.dev/tutorials/customize-theme-showing-selling-plan-groups-and-selling-plans but still selling plans are not seeing at the product page in store front even while using a development store with access to the beta.
my store is : https://mysubscriptioncistore.myshopify.com/products/test-product.
Can anyone please check if anything is missing to show plans at storefront?
Thanks!