I am having a similar issue, I am unable to pay a old invoice that auto payment didn’t pay due to a billing bug with CF.
When I try to pay it manually I get the following error from your Stripe portal
This payment intent cannot be confirmed on this Hosted Invoice Page because it is not for this invoice.
I have two tickets open one over a month old with Cloudflare and just get automated responses.
I need a human to look into it as its a engineering issue.
Case Number 01497996
If you already have a case, Support will respond to you on that case.
If not, you need to follow these directions here, Billing, Plans & Subscription Questions. The Community cannot assist with Billing, Account, Trust & Safety, nor Registrar issues, you need a case with Support.