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Worker A binding to Worker B leads to `403` error upon runtime fetch call. Why?

I have two works, A & B, A binds to B. When A does the

env.BINDING.fetch(...)

env.BINDING.fetch(...)

call it leads to a 403 response. That response is NOT coming from our code. Why is CF doing this?

The body response is:

error code: 1003

Worker A binding to Worker B leads to `403` error upon runtime fetch call. Why? - Cloudflare Developers