Step-by-Step Fix
1) Confirm the exact symptom
Write down the exact message, when it started, and whether it affects one browser/device or everything.
2) Run the two isolation tests
- Incognito/private window
- Second network (phone hotspot, no VPN)
3) Reset browser/session state
- sign out/in
- hard refresh
- clear site data for the Claude site
- disable extensions temporarily
4) Rule out VPN/proxy and network filtering
Disable VPN/proxy and retry once on a stable network.
5) Verify account/workspace context
Confirm you’re using the correct account/workspace for the feature or billing state.
6) Escalate with a clean report
Include: error text, timestamp, region, browser/app + OS, and what you already tested.
Common Root Causes
- stale session/cookies
- extensions blocking requests
- VPN/proxy or network filtering
- wrong account/workspace
- platform-side incident or rollout
Prevention Tips
- keep one clean browser profile for Claude
- avoid rapid retries after errors
- use hotspot + incognito as the first diagnostic step
Why This Happens
Claude workspace access denials are caused by one of three underlying problems: a session credential mismatch (your browser holds an old token that has been invalidated by a logout elsewhere, a password change, or a plan change), a workspace-level permission change (an admin removed your role or changed SSO requirements after you last logged in), or a network-level block (a VPN, corporate firewall, or proxy is interfering with the authentication handshake). The incognito + hotspot test isolates which layer is responsible in under two minutes.
Common Mistakes to Avoid
- Retrying the same browser without clearing session state: If stale cookies are the cause, refreshing or trying the same browser repeatedly will not help. Clear site data or use incognito before concluding the issue is account-level.
- Ignoring the VPN/proxy as a suspect: VPN exit nodes are frequently blocked or flagged by cloud services. Disable it before testing any other fix.
- Contacting support too early without isolation data: A report that says "I can't access my workspace" gives support nothing to work with. Always include what you tested (incognito, second network) and exact error text.
- Not confirming which workspace you belong to: If your organization has multiple Claude workspaces, you may be attempting to access a workspace you were never added to, or one that requires a different SSO provider than the one you used.
- Assuming the issue is account-wide without testing on mobile: A desktop browser issue is not necessarily an account issue. Try the Claude mobile app or a different device to confirm scope.
FAQ
Q: How do I tell if the access denial is on Claude's side or my network?
Open claude.ai in a private browser window on your phone's cellular data with no VPN. If it loads normally, the issue is local to your desktop environment — either a browser extension, VPN, or network filter. If it fails on cellular too, the problem is account-level or Claude is experiencing an incident. Check anthropic.com/status for active incidents before spending time on local troubleshooting.
Q: My workspace was working yesterday and nothing changed. Why is it failing today?
Session tokens have expiration windows, and Claude periodically issues new tokens that invalidate old browser sessions. Even if you did not change anything, your session may have expired after 7 to 30 days depending on security settings. A logout and fresh login is the fastest fix. If you use SSO (Google Workspace or similar), your organization's SSO session may have expired independently.
Q: What does "access denied" look like when SSO is the cause?
SSO-related access denial typically shows an error from your identity provider rather than from Claude directly — you may see a message from Google, Okta, or Azure saying "You do not have permission to access this application." This means your IT admin needs to add you to the Claude application in your organization's SSO system, not that you need to fix anything in your browser.
Q: Can a plan downgrade cause workspace access denial?
Yes. If your team's plan was downgraded and certain workspace features were removed, users who previously had workspace access may lose it if the downgraded plan has a lower seat count. Contact your workspace admin to confirm your seat is still allocated. The admin can check this under the workspace billing settings.
Q: How do I report the problem to Claude support effectively?
Include the following in your support request: the exact error message (screenshot preferred), your browser and OS version, whether the error happens in incognito, whether it happens on a different network or device, the email address associated with your Claude account, and the timestamp when the problem started. Support can trace session invalidation events in their logs if you provide the approximate time.
Related Issues
Additional FAQ
Q: What is the fastest way to diagnose a login problem? The fastest diagnostic is to open an incognito or private browser window and attempt to sign in there. Incognito windows run without extensions and use fresh cookies, which isolates the two most common causes: a browser extension interfering with authentication, or corrupted session cookies. If login works in incognito, the issue is your main browser profile. If it still fails, the problem is your network, your account, or a platform-side incident.
Q: Why does clearing browser cache fix login issues? Your browser caches session tokens and authentication cookies that prove you are logged in. If these become corrupted or expire mid-session, the browser may present an invalid token on each page load, causing the server to reject the session and redirect you to login. Clearing site-specific data forces the browser to request fresh tokens on the next login, which resolves most session-related loops without affecting your other browser data.
Q: Should I try a different browser if login keeps failing? Yes — testing in a second browser is one of the most useful steps. Different browsers use different cookie stores, extension ecosystems, and caching mechanisms. If login works in Browser B but fails in Browser A, the issue is specific to Browser A's state (likely extensions or corrupted profile data), not your account. You can continue working in Browser B while you troubleshoot the original browser.
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Additional FAQ
Q: What is the fastest way to diagnose a login problem? The fastest diagnostic is to open an incognito or private browser window and attempt to sign in there. Incognito windows run without extensions and use fresh cookies, which isolates the two most common causes: a browser extension interfering with authentication, or corrupted session cookies. If login works in incognito, the issue is your main browser profile. If it still fails, the problem is your network, your account, or a platform-side incident.
Related Articles
- Claude usage limit reached
- Claude rate limit fix
- Claude blank page white screen
- Claude can't log in fix
Additional FAQ
Q: What is the fastest way to diagnose a login problem? The fastest diagnostic is to open an incognito or private browser window and attempt to sign in there. Incognito windows run without extensions and use fresh cookies, which isolates the two most common causes: a browser extension interfering with authentication, or corrupted session cookies. If login works in incognito, the issue is your main browser profile. If it still fails, the problem is your network, your account, or a platform-side incident.