Orion bug: ChatGPT/OpenAI login + 2FA fail even with Compatibility Mode

[0xnikr]

Bug report / routing request

I am reporting a serious Orion browser compatibility bug that makes ChatGPT/OpenAI effectively unusable while trying to sign in.

I know the preferred product-bug route is OrionFeedback.org. I attempted to submit there, I wanted to also route this through Kagi's official GitHub org/repo so the team has another copy and can forward/triage it appropriately.

Summary

Users trying to use ChatGPT/OpenAI in Orion cannot reliably log in. Even after enabling Compatibility Mode for every ChatGPT/OpenAI page/URL involved and retrying the full sign-in flow, OpenAI’s login/2FA flow fails.

Observed behavior

1. Open ChatGPT/OpenAI in Orion.
2. Attempt to sign in.
3. User has to enable Compatibility Mode for ChatGPT/OpenAI pages/slugs/URLs.
4. Retry sign-in.
5. Enter email and password successfully.
6. Complete or attempt 2FA.
7. OpenAI shows a red error: “This option is temporarily unavailable.”
8. Trying another 2FA option, such as push notification or email, produces the same red error.
9. Result: the user cannot complete login and cannot use ChatGPT signed in through Orion- even IF they successfully enter the correct 2FA code from whichever channel.

*Important details

• Happens in regular browsing mode.
• Happens in private browsing mode.
• Happens even after Compatibility Mode is enabled for OpenAI/ChatGPT pages.
• The failure appears specifically around OpenAI’s auth/2FA flow rejecting something about Orion’s browser/session behavior.
• This is not just a minor rendering issue; it blocks access to ChatGPT entirely for affected users.

*Expected behavior

ChatGPT/OpenAI login should work in Orion without users having to manually enable Compatibility Mode across multiple OpenAI/ChatGPT URLs, and 2FA options should complete normally.

*Impact

This makes Orion unusable for ChatGPT users who need to sign in, despite ChatGPT being one of the most important web apps people use daily.

*Requested investigation areas

Please investigate Orion’s compatibility with OpenAI/Auth0/ChatGPT login and 2FA flows, especially:

• cookies/session state
• fingerprinting/privacy protections
• Compatibility Mode inheritance across OpenAI/Auth0/ChatGPT subdomains
• storage isolation
• user agent/client hints
• popup/redirect behavior
• anti-fingerprinting behavior that could cause OpenAI to reject 2FA options

Thanks.