Do I need to hire the Power Tuning portal? Can't I use Microsoft's?
Microsoft offers the ability to contract Power BI Embedded (or Fabric) through Azure, which is nothing more than a feature that allows you to generate an UNLIMITED number of tokens for embedding reports.
If you use the standard Power BI Portal, then you're still in the current scenario, where you need a Pro (or Premium per User) license for each user who publishes or views reports.
To use this type of license, which is different from all other types of Power BI licenses, you must use a web application to generate these tokens automatically and make the reports available to your users, because Microsoft does NOT provide a portal or source code for a portal ready to be used.
You can create your own portal, using a programming language, where you will implement all the code to manage users and permissions, render the reports, create the site layout, implement security, manage the application server, database, fix problems, implement new features, etc.
Another option is to hire a ready-made portal, with all this (and MUCH more) already created and ready to use, in the SaaS (Software As A Service) model, where you don't have any worries or anything to manage, you just use the system, which is updated constantly and very frequently.
Atualizado