Using Atlassian MCP within Cursor error 400

[Daniel McKenzie]

Hi,

I am trying to connect curson on https://mcp.atlassian.com/v1/sse, it brings me to the login page, I accept, it moves me back to cursor to accept the redirect but when I do I get this error :

2025-06-23 10:21:59.398 [info] [user-Test] Received OAuth callback with code

2025-06-23 10:21:59.755 [error] [user-Test] Failed to complete OAuth exchange Token exchange failed: HTTP 400

My mcp config is :

"AtlassianMCP": {

      "url": "https://mcp.atlassian.com/v1/sse"

    }

Any idea what can cause this, some collegues are able to log on the corporate Jira with the same setup? What am I missing?

[amy.keating · Accepted solution]

I am having the exact same issue.  Would love an answer as well.

[Jason Myers]

I'm also having this issue, but it works in VSCode

[Daniel McKenzie]

@Jason Myers How do you trigger a LLM search from VSCode easily? I would like to test it in VSCode if I'm having the same issue as you?

[Jason Myers]

So I got it to work in Cursor now also:

---

"atlassian": {
  "command": "npx",
  "args": [
     "-y",
     "mcp-remote",
     "https://mcp.atlassian.com/v1/sse"
  ]
}

Then my prompt is something like:
Let's create a plan for jira ticket AIP-237 and store it in a markdown document. don't worry about timelines just focus on the development tasks.

[Dr Valeri Colon _Connect Centric_]

@Daniel McKenzie The HTTP 400 error during OAuth usually means the callback failed due to an invalid or expired code, a mismatch in redirect URI, or the domain not being whitelisted. Make sure your Cursor setup includes a valid redirect URI that's registered and whitelisted with Atlassian. Also confirm your MCP access is enabled and the session token exchange isn’t blocked by browser settings or network restrictions.