Hi Shittu Adesoji (NHQ-AC-CONSULTANT) Thank you for reaching out.
You can follow the steps in the following blog to set up RBAC on your Azure Cosmos DB Mongo API. Role-based access control in Azure Cosmos DB API for MongoDB:
https://learn.microsoft.com/en-us/azure/cosmos-db/mongodb/how-to-setup-rbac
Please let us know if you need further assistance on this or additional clarification.
Regards,
Oury