error_page on server level not respected

[ScreamingDev]

auth_request and error_page on server lever does not work. The error page does not show up.

#works not
#         auth_request /foo-auth;
#        error_page 401 @foo-authentication;
# neither other way around

location / {
        # works
        auth_request /foo-auth;
        error_page 401 @foo-authentication;