750 Hours a year

I actively manage my 3 rental properties along with my full time non real estate job.  I do all the maintenance, I look for tenants, screen tenants, I do everything.  I keep records of everything I do.  When I select the 750 hours a year actively involved in real estate it comes back and says I don't qualify.  Any reason why not and if it did allow me what benefit would I have received?