Phidias Propfirm accounts cannot be connected to the NinjaTrader platform at this time. Ninja trader no longer offers services to new Propfirms.
Message from NinjaTrader: Until next summer, we will only offer our services to existing firms. Ninja is in the process of creating its own propfirm provider environment.
All platforms, except Ninja Trader, that support Rithmic feeds can be used with your Phidias Propfirm accounts (Sierra Chart, Quantower, Atas, Bookmap, etc.) see the list of platforms available with Rithmic feeds here: https://yyy3.rithmic.com/?page_id=10
We can help you set up the platforms, especially Sierra Chart, which we and the Phidias Propfirm team are very familiar with.
We are currently in discussions with the NinjaTrader team, and the connection between Phidias Propfirm and NinjaTrader should be in place soon.