Hi @MStrudwick
That’s true, I wouldn’t expect it to fail and then work if the request is the same. I would recommend adding some logging to your outgoing requests in order to see if there’s anything different in the body or headers between the original request and the retry.
The unauthenticated scopes provide a different layer of access and are meant for the storefront API - this allows customers to indirectly interact with store data, however if you are creating customers with orders via the admin API, you require the authenticated access. You can read more about this here: https://shopify.dev/api/usage/access-scopes#unauthenticated-access-scopes
Regards,