I am having the same problem, and I see the error message in the preview as well as in the website. When I click on the hashtag link “check for tweets”, it takes me to a twitter page listing all the messages for that hashtag. I thought it might be because it needed time, but one hashtag has two years being used (#bronxedtech), and another has over 3 months when it started to be used (#hostosheoretreat ).
I checked for security settings to allow my tweets to be public, etc.; but nothing works
HELP PLEASE
I ADDED NEW TWEETS AND IT STILL SHOWS AN EMPTY TIMELINE!