CloudFlare WordPress plugin admin won't load, red "Forbidden" error bar

Cloudflare WordPress plugin admin fails to load completely and produces a red “Forbidden” error bar. It had been working fine previously.

No errors in the console but there is a ZONES_FETCH_ERROR log.

WP version: 6.4.3
Plugin version: 4.12.7 (latest version, but previous version we had installed also not working)

Admin:

To follow up, the auto-purging of content from the cache on update is also not working.

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