If you have an Azure SQL Server 2022 Enterprise Edition, you can indeed use SQL Server Reporting Services (SSRS) and Power BI Report Server as part of your SQL Server license benefits. With the Enterprise Edition, you have the rights to use these reporting services without additional charges.
Regarding the installation of SSRS and Power BI Report Server without a product key, if you're installing these services on a SQL Server instance that is already covered by your license, you typically don't need a separate product key. During the installation process, you should be prompted to select the edition (Enterprise Edition, in your case) and then proceed with the installation without entering a product key.
If you encounter a prompt asking for a product key during installation and you're not provided with one, you may need to check your licensing agreement or reach out to Microsoft support for assistance. They should be able to help you with the installation process and clarify any licensing-related questions you may have.