I’m unable to log into the Epic Games Store using Firefox Developer Edition on Windows 10.
The CAPTCHA itself appears to work correctly. I inspected the network requests in Firefox DevTools and found the following:
-
Epic presents an hCaptcha challenge.
-
I complete the challenge.
-
The request to
api.hcaptcha.comreturns HTTP 200 with:
{
"pass": true,
"generated_pass_UUID": "P1_..."
}
- Firefox then sends the resulting hCaptcha value to Epic as part of the request to:
POST https://www.epicgames.com/id/api/email/exists
- Epic responds with HTTP 400:
{
"errorCode": "errors.com.epicgames.accountportal.captcha_invalid",
"message": "Incorrect response. Please refresh the page.",
"correlationId": "..."
}
I also verified that the P1_... value returned by hCaptcha is the same value subsequently included in Epic’s captcha.plan_results.h_captcha.value payload.
So this does not appear to be a case of incorrectly solving the CAPTCHA. hCaptcha explicitly returns pass: true, and Firefox forwards the resulting value to Epic.
Comparison with Microsoft Edge
On the exact same PC, using the same network connection and the same Epic account, Microsoft Edge works successfully.
Interestingly, Edge doesn’t present an hCaptcha challenge at all. The login flow proceeds normally.
Troubleshooting already performed
I’ve also tested:
-
Firefox Developer Edition normally → fails
-
Firefox Private Browsing → fails
-
Enhanced Tracking Protection disabled → fails
-
Extensions disabled → fails
-
Different DNS servers → fails
-
Microsoft Edge on the same PC/network → succeeds
The problem is therefore reproducible specifically in Firefox, while the same account and network work in Edge.
I’d appreciate it if someone from Epic could investigate the captcha_invalid response on the account portal side. I can provide additional network traces and correlation IDs if useful.
Firefox: Firefox Developer Edition 155
OS: Windows 10
