Error code: 1006 - How to remove?

We run a service which uses Cloudflare Workers as a custom reverse proxy.

Some of our users are now receiving the dreaded "error code: 1006" error when accessing URLs on some of our custom domains which hit our Worker.

Looks like that means Cloudflare has banned that IP address.

This has only started occurring in the last few hours, with absolutely no changes on our side.

How can we get Cloudflare to allow request to our Worker from all IP addresses?
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