[Remote MCP] Error when trying to log in - Error: Metadata error:

What version of Codex is running?

codex-cli 0.50.0

What subscription do you have?

api key

Which model were you using?

gpt-5

What platform is your computer?

Darwin 25.1.0 arm64 arm

What issue are you seeing?

Ive set my config to use a remote mcp with oauth.

I have set - experimental_use_rmcp_client = true

[mcp_servers.remote]
type = "http"
url = "https://xxxx.com/mcp/default"

when using codex mcp login remote

Error: Metadata error: Failed to parse metadata: error decoding response body

The mcp server and oauth work in other applications i.e copilot, claude etc

What steps can reproduce the bug?

set config for a remote server

run codex mcp login $server_name

What is the expected behavior?

directed to an oauth login page for authentication.

Additional information

_No response_