Where's Cookie when you need her to whip everyone into shape?
According to Page Six, Quincy was "guaranteed a role" by producers, but the casting fell through when 20th Century Fox required Quincy to sign over a portion of his music rights.
Fox doesn't comment on casting rumors. However, multiple sources tell E! News that Quincy was never actually offered a role on Empire. He did have some very preliminary talks, but Diddy's son never tested for a role, and wasn't offered a part. There was never an issue regarding his music rights. Timbaland has been Empire's music director from the get-go, and the show uses his library of music, as well as original songs that are sold on iTunes.