Can't buy assets because of "Failed to challenge captcha"

The problem is not your card issuer, the problem is the processor company that would take your information, verify it, and then send it to your card issuer. E g, a company like Stripe, or PayPal. Those companies somehow believe your attempt is fraudulent (for whatever reason – ad blockers? browser incompatibility? internet region? bad deploy? bad configuration by Epic web developers?) and thus don’t forward the request at all to your card issuer/bank, so of course they won’t have a record of it.