[BUG] Atlassian MCP Sign In does not work

[prodigy]

Environment

• Platform (select one):
  • [x] Anthropic API
• Claude CLI version: 1.0.33 (Claude Code)
• Operating System: Windows, WSL Ubuntu 24.04.2 LTS
• Terminal: Bash in VS Code connected to WSL

Bug Description

Authentication with Atlassian fails when clicking the link to sign in with this message:

The redirect URI is not allowed, the URL is not part of Atlassian whitelisted domains for registered MCP Clients. Redirect URI

Steps to Reproduce

1. claude mcp add --transport sse atlassian https://mcp.atlassian.com/v1/sse
2. claude
3. /mcp
4. Select atlassian, hit enter
5. Click link to open browser: https://mcp.atlassian.com/v1/authorize?response_type=code&client_id=1ecEWU0Qn6LC8mAO&code_challenge=REDACTED&code_challenge_method=S256&redirect_uri=http%3A%2F%2Flocalhost%3A60953%2Fcallback&state=REDACTED
6. Blank website states:

   The redirect URI is not allowed, the URL is not part of Atlassian whitelisted domains for registered MCP Clients. Redirect URI

Expected Behavior

Authentication works

Actual Behavior

Authentication fails

[prodigy]

Okay I figured out the issue. The problem is, when clicking the link, it only opens a partial link without the redirect uri in the browser. When copy pasting the link it works just fine. Seems to be an issue with the windows console window / terminal I guess, as the link is printed over multiple lines.

[secustor]

Where do you got the link from 🤔

For me it shows in Claude Code and logs only https://mcp.atlassian.com/v1/sse and the site does not redirect to an auth flow.

[prodigy]

You do claude mcp add --transport sse atlassian https://mcp.atlassian.com/v1/sse. Then after launching claude, type /mcp. Then hit enter on atlassian. Then there is a link to sign in. 😊

[secustor]

Thanks!
I have been doing this, but it seems to have been an issue with Claude Code and HTTPS_PROXY variables. After upgrading CC showed me the URL as you describe, but the login works as expected.

[maxres-ch]

on 1.0.112 and I'm not seeing the browser window being opened

[btruhand]

on 1.0.112 and I'm not seeing the browser window being opened

Same for me on 1.0.115 :(

Edit: Actually just figured out it's because of WARP by Cloudflare

[LunaTravel]

On the latest version 1.0.128 (Claude Code), the issue remains.

When connecting to MCP servers that require authentication, Claude Code attempts to automatically open a browser for auth flow. The following page is shown:

Browser should open automatically, OR If auto-open fails, the authentication URL should be displayed in the terminal for manual copy/paste

But browser opening fails in both WSL2 and PowerShell environments. And no fallback URL is provided when auto-open fails, preventing users from manually copying and pasting the URL into a browser.

[epam-avramenko]

I suggest you to update your node version. By default, apt installs v18. Update it to the latest. It helped me.