MarketBookAdd() function does not working at many brokers. Why?

 

Dear Support,

I found this issue. I tried  this function at different brokers/servers  and I realized that at many brokers  (IcMarkets, Pepperstone, AvaTrade, TitanFx...) this function does not working. Always return with false.

Is it possible to allow this function for all brokers?

Thanks.