GitHub Pages build fails with "Actor is not allowed to trigger Actions workflows"

[olddox]

My repository is olddox/ocolor (public, personal account). I uploaded an index.html
via the web UI and enabled GitHub Pages (Settings → Pages → Deploy from a branch,
main / root).

The "pages build and deployment" workflow run fails immediately with:

Startup failure
Error: Actor is not allowed to trigger Actions workflows.

Repository Settings → Actions → General is set to "Allow all actions and reusable
workflows", so it's not a repo-level restriction. My account email is verified.

Could someone help me understand why my account/actor is blocked from triggering
Actions workflows, and how to resolve it?

Repo: https://github.com/olddox/ocolor

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