There are many different ways that you can design and build multitenant solutions in Azure. At one extreme, you can share every resource in your solution among all of your tenants. At the other extreme, you can deploy isolated resources for every tenant. It might seem simple to deploy separate resources for every tenant, and it can work for a small numbers of tenants. However, it typically doesn't provide cost effectiveness, and it can become difficult to manage your resources. There are also various approaches that fit between these extremes, and they all have tradeoffs like scale, isolation, cost efficiency, performance, implementation complexity, and manageability.

https://learn.microsoft.com/en-us/azure/architecture/guide/multitenant/approaches/overview