Atlassian MCP OAuth fails: callback URL mismatch (random port vs registered 33418)

Version: Copilot CLI 1.0.84-3 (tested on 1.0.83 and 1.0.84-3)
Environment: WSL Ubuntu 24.04
MCP Server: Atlassian (https://mcp.atlassian.com/v1/mcp/authv2)

Issue:
When connecting to the Atlassian MCP server via Copilot CLI, OAuth always fails with:
"The app's callback URL is invalid. Contact the app developer to fix the redirect URL in the app's settings."

Root Cause:
Copilot CLI generates a random localhost port for OAuth redirect on each auth attempt, but the GitHub Copilot CLI client metadata at https://github.com/copilot/cli/client-metadata.json only registers:

• http://127.0.0.1:33418/ (only valid callback)

Observed redirect attempts: 55096, 64611, 50069, etc.
Atlassian OAuth validation rejects these mismatched ports.

Workaround Needed:

• Either hardcode Copilot CLI to always use port 33418
• Or expose a configurable --redirect-port flag
• Or update client metadata to accept random ports within a range

Error ID: c66b2f8a-87f3-404d-9e60-41b4d023c67c

Reproduire d’abord l’échec OAuth dans WSL Ubuntu avec le Atlassian MCP server et comparer les ports de callback aléatoires observés avec client-metadata.json. Inspecter ensuite où Copilot CLI sélectionne son port de redirection OAuth. C’est terminé lorsque l’authentification réussit en utilisant le callback enregistré 33418 ou une alternative configurable clairement prise en charge.