There are 5 different sign-up waiting lists. Each one needs to be signed-up for separately.

[1] Copilot X: https://github.com/github-copilot/chat_waitlist_signup/

[2] Copilot Voice: https://githubnext.com/projects/copilot-voice/

[3] Copilot Docs: https://githubnext.com/projects/copilot-for-docs/

[4] Copilot for PRs: https://githubnext.com/projects/copilot-for-pull-requests/

[5] Copilot CLI: https://githubnext.com/projects/copilot-cli/