Implementing Azure AD Authentication In Blazor web assembly is very much similar to Blazor Server.
Please read the below post to know more details about azure portal configuration for Blazor Server

Step 2: Select the Access Token and Id Token like this

Now create the Blazor Webassembly project with Microsoft Identity Platform

Now it will install, all the Authentication related nuget package and boilerplate code for us.
Step 3: Go to appsettings.json file and keep the TenantId and ClientId here.

