could not run legacy post zone sub request against new zone products: failed to update user subscription: failed to apply object products: You cannot add or modify subscriptions or services until the outstanding balance is paid. You should be able to do so in your Billing page.
What is the issue you’re encountering
I can’t add the domain due to a billing error.
What steps have you taken to resolve the issue?
Every time I try adding my domain to Cloudflare and select the free option, I get that error.