When running CORS check it's not sending remaining headers.

[richtera]

happy-dom/packages/happy-dom/src/fetch/Fetch.ts

Line 288 in e6f9127

headers: new Headers({

For authenticated services the Authorization header doesn't seem to be sent to the OPTIONS request, making them fail with a 401 instead of passing the CORS check. Switching from happy-dom to node-fetch in jest passes the test.