Cookies not getting sent with get/post request

I’m currently using localhost:5000 for my backend and localhost:3000 for my frontend. When I log in I post login credentials to my backend and receive the auth-token as a cookie. I can see the cookie in “Cookies”. The problem is that when I try to access a private route, the cookie is not sent with the request, and therefore I cannot get authenticated.

How can I send the cookie with the request?