When adding an external MCP server, Atlasian will authenticate using the OAuth 2.0 DCR according to this documentation:
https://support.atlassian.com/organization-administration/docs/add-an-external-mcp-server-from-atlassian-administration/
What's the domain used in the redirect URL of the authentication flow? This is required so we can whitelist Atlassian when registering with our MCP server.
