You can also drop your route into a preexisting authenticated scope if you have one

scope "/" do
  pipe_through [:browser, :require_authentication]

  # ... other authenticated routes

  live_dashboard "/dashboard"
end

or, if you only want to require authentication in production but not in other environments:

live_dashboard_pipeline =
  case Mix.env() do
    :prod -> [:browser, :require_authentication]
    env when env in [:dev, :test] -> :browser
  end

scope "/" do
  pipe_through live_dashboard_pipeline

  live_dashboard "/dashboard"
end

You may want to conditionally render the link as well:

<%= if function_exported?(Routes, :live_dashboard_path, 2) && @current_user do %>
  <%= link "Dashboard", to: Routes.live_dashboard_path(@conn, :home) %>
<% end %>

I have something like this in my router:

pipeline :protected do                                                                                                                                                  
  plug MyApp.RequireAuthenticated
end 

scope path: "/admin/dashboard" do                                                                                                                                  
   import Phoenix.LiveDashboard.Router                                                                                                                              
                                                                                                                                                                      
   scope "/" do                                                                                                                                                     
     pipe_through(:browser)                                                                                                                                         
     pipe_through(:protected)                                                                                                                                       
                                                                                                                                                                      
     live_dashboard "/"                                                                                                                                
  end   
end

Which is basically created an authenticated pipeline, that has one Plug that you seem to already have. Then, create a scope at where you want to have your dashboard, and make that scope go through the pipeline you just defined.

I don’t see the problem, and maybe you don’t need to write a custom plug but use this Plug.BasicAuth — Plug v1.20.2 ?