GitHub login not working for Sanity projects - known issue?

I can see from the Sanity Status page that all systems are currently operational, including Authentication. There are no active incidents reported for GitHub login issues today.

However, login issues with GitHub OAuth can happen for a few different reasons. Here are the most common causes and troubleshooting steps:

Browser Third-Party Cookie Issues

The most common cause of GitHub login failures in 2025 is third-party cookies being blocked. Chrome and other browsers have been phasing out third-party cookies, which can break OAuth flows:

• Check your browser settings: Ensure third-party cookies are allowed, at least for sanity.io and github.com
• Try a different browser: Test in another browser or incognito/private mode to rule out browser-specific issues
• Clear cookies and cache: Sometimes stale authentication cookies cause problems

Checking Service Status

Since you're experiencing this across multiple projects and Studio versions, I'd recommend:

1. Check the Sanity Status page for any ongoing incidents (currently showing all green)
2. Check GitHub's status page to see if there are any OAuth-related issues on their end
3. Try alternative login methods: If you have Google or other providers configured, try those to rule out Sanity-specific issues

Recent Authentication History

Looking at the status page history, there was an authentication-related incident on October 20, 2025, but nothing recent. The Authentication component currently shows 100% uptime over the past 90 days.

Next Steps

If the issue persists after checking browser settings:

• Try accessing Sanity Studio from a different network (mobile hotspot, different WiFi)
• Check your browser's developer console for specific error messages during login
• Contact Sanity support with details about the error messages you're seeing

Since this is affecting all your projects across different Studio versions, it's most likely a browser/cookie issue rather than a platform-wide outage. The third-party cookie changes in modern browsers are a known cause of OAuth login problems in 2025.