Some ISPs are refusing my subdomain

I have changed the nameservers of my domain to the CloudFlare nameservers I was assigned, and the domain is being refused by certain ISPs (most importantly for me, Deutche Telekom).

I am hosting a Shopify store on my www subdomain (CNAME pointing to shops.myshopify.com), and I’m hosting a WP site on another subdomain (blogname.example.com). The WP site is working, but the Shopify store is not working on a select few ISPs. Anyone have any suggestions on how to fix this, or who to contact about it?

It may take some extra time for some ISPs’ DNS to update. What error are you seeing?

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