The previous conversation here: https://community.shopify.com/c/graphql-basics-and/graphql-api-productcreate-does-not-publish-product-to-channel/m-p/1570760
Was never fully addressed and is still unresolved. Everyone who has migrated to graphql away from REST etc are now stuck STILL using depreciated end points all because unless you happen to be on a Shopify Plus platform or working with clients on Plus then you are effectively stuck.
We still cannot define new products channel availability and it is now March 2025… like seriously are Shopify Developers actually going to bother to fix this issue after creating the disconnect between product create and channels in the first place?!
And NO I will not resort to going back to REST depreciated end points which can at any update cycle disappear or cease to function. This is NOT the right answer.