Client Dashboard Solution

I'm fairly new to Power BI and am creating some visualizations. What is the best method for distributing to clients, with the following in mind:

1. Client data is confidential. Client 1 shouldn't be able to see Client 2's data.

2. All data is stored in SQL Server. Could also be in Excel if necessary.

3. We don't want the client to have to download anything; so a web-based solution would be best. Ideally they log in and see the same dashboard as all other clients, but the data feeding it is specific to them.

Thanks!