UTM attribution in Shopify checkout process

[analytics2]

I'm debugging UTM tracking issue for Shopify store, I directly enter checkout by appending UTMs to the link( on new browser) and then make test purchase, here when I check session report it shows session converted with correct UTMs but when I check order/sales report there, I don't see those test orders reported to the correct UTM and it shows UTM NA

Here I'm entering directly on checkout because product pages are on 3rd party platform but home page and checkout pages are on Shopify. 

What could be the reason? I've reached out to Shopify plus support but didn't get sensible reply from them.

Please let me know if you need more information on this set up to help me. thank you.

[KoalaFR]

A solution? The post is two years old, and I’m facing the same issue: on a link pointing directly to the checkout, it’s impossible to have the UTMs in the conversion.