Hi @Maitreya_Awad I am confused. Is your MongoDB data hosted in Atlas or on Premise? If you are on Atlas, you will want to use the Atlas SQL Interface and Custom Certified Power BI Connector with the Atlas SQL ODBC driver. If you are on-premise you will use the on-prem BI Connector for connection to Power BI.
With Atlas SQL, an M0 will work, but you are required to be on db version 5.0 or higher. Please feel free to email me to set up a zoom and I can help sort your setup/config. Alexi.Antonino@mongodb.com