Recently, i think two weeks ago, it used to work but nowadays if you try the search widget with “from:08pc10” no result is shown.
You can test it:
b) In the ‘SearchQuery’ field indicate
and press the ‘Test configuration’ button
c) The widget appears in blank, but there are tweets to be found.
d) Nevertheless, in the same widget, the ‘Join the conversation’ link works properly
The same with “from:08ptt”.