How Orange-to-Orange (O2O) works
Orange-to-orange (O2O) is when a Cloudflare zone sends proxied traffic to another Cloudflare zone through Cloudflare.
Without O2O
Without O2O, the settings of your SaaS provider override whatever settings are applied to your own Cloudflare zone.
With O2O
With O2O, Cloudflare can apply the settings specified by both you and your SaaS provider.