Claude Redirect URI Is Not Supported by Client | Ways to Fix

The “Redirect URI is not supported by client” error in Claude Code usually points to a mismatch between what the CLI expects and what the Anthropic authentication server has on record.

On March 19, 2026, this is likely tied to the ongoing server instability or a specific configuration bug in the latest version of the CLI.

Here are the most effective ways to bypass this and get back to coding:

Ways to Fix it

1. The “Manual Auth” Workaround (Most Reliable)

If the browser auto-redirect is failing, you can often trigger a manual flow that doesn’t rely on the local redirect URI.

• The Fix: When you run claude, and it attempts to open the browser, cancel/deny the first link if it hangs.

• Look for the “Copy Link” option: In many versions of the CLI, if the automatic browser open fails (or you cancel it), it will provide a backup URL in the terminal.

• Paste and Copy Code: Paste that URL into your browser, authorize the app, and it should provide a short alphanumeric code. Paste that back into your terminal.

2. Check for URL “Formatting” Errors

Recent bug reports (from early 2026) show that the CLI sometimes generates a redirect URL with a hidden space or an extra character.

• The Bug: Check the URL in your browser address bar. Look for %20 or a space between call and back (e.g., .../call%20back instead of .../callback).

• The Fix: Manually delete the space or %20 in the address bar and hit Enter. This often completes the handshake.

Also Read : Claude Reached Its Tool-Use Limit for this Turn

3. Change Your Default Browser

There is a known issue where certain privacy-focused browsers (like Brave or Safari) block the “localhost” loopback that Claude Code uses to confirm you’ve logged in.

• The Fix: Set your default browser to Google Chrome or Firefox temporarily.

• Restart the flow: Run /logout in your terminal and then claude again to trigger a fresh login request.

4. Update the CLI

Anthropic has been pushing “hotfixes” rapidly due to the outages this week. You might be running a version that has a hardcoded, outdated redirect URI.

• Command: npm install -g @anthropic-ai/claude-code@latest

• Why: Version v1.0.54 and later specifically addressed several OAuth browser flow bugs.

5. Clear Stale Sessions

If you’ve tried multiple times, your local session tokens might be “dirty.”

1. Run claude /logout.

2. Delete the Claude config folder (usually found at ~/.claude on Mac/Linux or %USERPROFILE%\.claude on Windows).

3. Try logging in again.

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