Resource protected by organization SAML enforcement

I'm connected to the GitHub MCP server on VSCode. When asking a GitHub related question in Copilot Agent mode, I'd get the following error:

```
Resource protected by organization SAML enforcement. You must grant your OAuth token access to this organization.
```

Couldn't find any issue related to this in this repo. Though I did find [one in the CLI repo](https://github.com/cli/cli/issues/2661), which suggests me to re-authenticate to GitHub with `gh auth login`. I tried before prompting Copilot but no luck. Same error.