DI: Registration of services through a builder.

services.AddAuthorization(c =>
{
    var tenantAuthRequirement = new TenantAuthorizationRequirement();
    c.AddPolicy(Policies.TenantAuthenticatedUser, p =>
    {
        p.AddAuthenticationSchemes(PreSharedKeyAuthenticator.Scheme, PartitionConstants.AuthenticationSchemaBearer)
          .RequireAuthenticatedUser()
          .AddRequirements(tenantAuthRequirement);
    });
}