Did you create your products in Clickfunnels? (I mean under Funnel step > Products), if not then that’s your issue, if you did then try to reach out to Clickfunnels support perhaps there is some delay affecting your products being shown in your funnel…
The error addressed itself when I changed the payment gateway from a dummy Stripe account to a dummy Blue Snap account.
The funnel uses Paypal as the only payment method and CF had an issue showing the products without a dummy account that the system recognized as real. Stripe didn’t flow through, but Blue Snap did.
That’s kind of the usual case can’t even create dummy account in stripe, so I have no clue how you did it as for bluesnap yep that’s usually the one that works or Infusionsoft.