I receive the error “Tradingview has not been entitled to access your account. Please login to the Client Dashboard, then select Add-Ons and grant permission to access for Tradingview” on NinjaTrader account

Please, log on  NinjaTrader Account Dashboard → click the blue User Profile icon at the top-right of the screen and select Settings → open Plans tab and find “TradingView. 

For more information, please check the guide on the Ninja Trader platform.