Users of my app have been complaining about not being receiving tweets from some specific user (@SydneyPogoMap). In fact the query
from:SydneyPogoMap doesn’t work neither in the web search (https://twitter.com/search?f=tweets&q=from%3ASydneyPogoMap&src=typd)
That account is very active, so he has enough recent tweets to be shown.
What could be causing this and what can be done to fix it?