Cloudflare worker works with debugging tools but not otherwise

Hey there,

I am currently trying to redirect a API-call.
As it stands my worker works in the debugging env but not when i call the url from my notebook or other devices.
My worker works just fine for calls from my notebook when switching to another API to redirect to (just to check). Also the worker can log the json I get from the origin-API.
The worker returns “unauthorized”, when it should because of false Authorization, but when entering into the redirect it returns Error Page not found from the origin-API. I tried to get this “page not found” with postman, but was not able to get the same result (trying different headers with different params missing, etc.)

Hope you can help me.
Thanks in advance!