Seems like there is a problem with citoid/zotero at nowiki, it won't create a citation for BBC (ex,api), which should work I guess, and the New Yorker (ex,api). Several local papers work (ex,api) as expected.
Some of the failing requests (ie in VisualEditor) seems to be awfully slow through the API, but they do return.
It is reported at w:no:Wikipedia:Torget#Utenlandske kilder virker ikke helt.
Note that I also found that I can't set the values of the rest API through the page (api), but I can create the url directly.