How can I authorize against an api with identity cookies

[janusqa]

Hi,
I'm using Identity Cookies for authentication (and authorization)?
This is a blazor web app.
It has an api also. if the api does not have [Authorize] all is well. If it does I get a 401 when accessing the api via httpclient/httpclientfactory.

I had assumed the cookies would have been passed along automatically but was a wrong assumption.

I am at this page https://learn.microsoft.com/en-us/aspnet/core/fundamentals/http-requests?view=aspnetcore-3.1#header-propagation-middleware

And probably have to use something like header propagation but am not sure how to use it with identity cookies.

How can I authorize against the api if i am using IdentityCookies