In this case I’m getting a status code 401:
Response { type: “basic”, url: “https://www.lechase.com/wp-json/contact-form-7/v1/contact-forms/16/feedback”, redirected: false, status: 401, ok: false, statusText: “”, headers: Headers(20), body: ReadableStream, bodyUsed: false }
index.js:1:7005
This might explain why it works if logged in. If you try to access the above URL you’ll see the JSON response code and message. This seems to indicate that there is an issue with WordPress’ REST API. I’m not experienced enough with this to know off the top of my head how to solve this but this at least gives a hint.
Do you have any REST API related plugins installed?