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Trouble with authenticating MCP server on Cursor

Srinath Chandrasekaran
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September 9, 2025

I am trying to setup Atlassian MCP on cursor code editor and I am facing the following problems

1. When I try to use the remove SSE URL using the following :
```"Atlassian-MCP-Server": { "url": "https://mcp.atlassian.com/v1/sse" }```
When I Connect for auth, I am getting the following error post redirect to cursor: 

`[error] Failed to complete OAuth exchange Invalid PKCE code_verifier`

The whole log is as follows
```
[info] Received OAuth callback with code
2025-09-09 14:09:03.442 [info] Using redirect URL {"url":"cursor://anysphere.cursor-retrieval/oauth/user-Atlassian-MCP-Server/callback"}
2025-09-09 14:09:05.526 [info] Using redirect URL {"url":"cursor://anysphere.cursor-retrieval/oauth/user-Atlassian-MCP-Server/callback"}
2025-09-09 14:09:08.930 [error] Failed to complete OAuth exchange Invalid PKCE code_verifier```

2. I have been using mcp-remote of npx to connect to the same by following 
```"mcp-atlassian-api": { "command": "npx", "args": [ "mcp-remote", "https://mcp.atlassian.com/v1/sse" ] }```

Here the issue is every window, I have to approve auth and every few hours it asks for auth again. 

Need some assistance on this as this has been really unusable.

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