Seems fine one day no results the next.
Im in New Zealand
You are not alone friend, Check this other topic here and your voice to it: https://www.halowaypoint.com/en-us/forums/e0d9938206f04a598ce84f2c8cadce02/topics/warzone-dont-work-south-ameria-africa-australia/06223e76-9c6e-45fe-af01-fb00160803b0/posts