If you can not see the brief in your dashboard you may have been removed from the brief or it has closed. This could be due to a multitude of reasons including budget constraints or other creators may have responded before you.
Even if a brand messaged you to confirm your interest, they still may not have chosen to move forward with your application. You will only be accepted in a brief if you received an email and the banner over the brief says "Accepted". If the banner over the brief says "Applied" you have not been accepted.
Our best advice is to respond to the brands within 2 business days!