diff --git a/dotnet/src/webdriver/BiDi/BiDi.cs b/dotnet/src/webdriver/BiDi/BiDi.cs
index f008d32a9394f..62e34dbc4de3b 100644
--- a/dotnet/src/webdriver/BiDi/BiDi.cs
+++ b/dotnet/src/webdriver/BiDi/BiDi.cs
@@ -53,12 +53,14 @@ private BiDi() { }
 
     public Emulation.IEmulationModule Emulation => AsModule<Emulation.EmulationModule>();
 
-    public static async Task<IBiDi> ConnectAsync(string url, Action<BiDiOptionsBuilder>? configure = null, CancellationToken cancellationToken = default)
+    public static async Task<IBiDi> ConnectAsync(Action<BiDiOptionsBuilder> configure, CancellationToken cancellationToken = default)
     {
+        if (configure is null) throw new ArgumentNullException(nameof(configure));
+
         BiDiOptionsBuilder builder = new();
-        configure?.Invoke(builder);
+        configure(builder);
 
-        var transport = await builder.TransportFactory(new Uri(url), cancellationToken).ConfigureAwait(false);
+        var transport = await builder.TransportFactory(cancellationToken).ConfigureAwait(false);
 
         BiDi bidi = new();
 
diff --git a/dotnet/src/webdriver/BiDi/BiDiOptionsBuilder.cs b/dotnet/src/webdriver/BiDi/BiDiOptionsBuilder.cs
index 96b17b516bb56..f8f4cba9bfcef 100644
--- a/dotnet/src/webdriver/BiDi/BiDiOptionsBuilder.cs
+++ b/dotnet/src/webdriver/BiDi/BiDiOptionsBuilder.cs
@@ -27,22 +27,21 @@ namespace OpenQA.Selenium.BiDi;
 /// </summary>
 public sealed class BiDiOptionsBuilder
 {
-    internal Func<Uri, CancellationToken, Task<ITransport>> TransportFactory { get; private set; }
-        = (uri, ct) => WebSocketTransport.ConnectAsync(uri, null, ct);
+    private Func<CancellationToken, Task<ITransport>>? _transportFactory;
 
     /// <summary>
-    /// Configures the BiDi connection to use a WebSocket transport.
+    /// Configures the BiDi connection to use a WebSocket transport with the specified URL.
     /// </summary>
-    /// <remarks>
-    /// WebSocket is the default transport; calling this method is only necessary
-    /// when you need to customize the underlying <see cref="ClientWebSocketOptions"/>
-    /// (e.g., to set headers, proxy, or certificates).
-    /// </remarks>
+    /// <param name="url">The WebSocket URL to connect to.</param>
     /// <param name="configure">An optional action to configure the <see cref="ClientWebSocketOptions"/> before connecting.</param>
     /// <returns>The current <see cref="BiDiOptionsBuilder"/> instance for chaining.</returns>
-    public BiDiOptionsBuilder UseWebSocket(Action<ClientWebSocketOptions>? configure = null)
+    public BiDiOptionsBuilder UseWebSocket(string url, Action<ClientWebSocketOptions>? configure = null)
     {
-        TransportFactory = (uri, ct) => WebSocketTransport.ConnectAsync(uri, configure, ct);
+        var uri = new Uri(url);
+        _transportFactory = ct => WebSocketTransport.ConnectAsync(uri, configure, ct);
         return this;
     }
+
+    internal Func<CancellationToken, Task<ITransport>> TransportFactory
+        => _transportFactory ?? throw new BiDiException("Transport is not configured. Call UseWebSocket(url) on BiDiOptionsBuilder.");
 }
diff --git a/dotnet/src/webdriver/BiDi/WebDriver.Extensions.cs b/dotnet/src/webdriver/BiDi/WebDriver.Extensions.cs
index f3eed2d70a17d..9fb4473705aa2 100644
--- a/dotnet/src/webdriver/BiDi/WebDriver.Extensions.cs
+++ b/dotnet/src/webdriver/BiDi/WebDriver.Extensions.cs
@@ -34,7 +34,11 @@ public static async Task<IBiDi> AsBiDiAsync(this IWebDriver webDriver, Action<Bi
 
         if (webSocketUrl is null) throw new BiDiException("The driver is not compatible with bidirectional protocol or \"webSocketUrl\" not enabled in driver options.");
 
-        var bidi = await BiDi.ConnectAsync(webSocketUrl, configure, cancellationToken).ConfigureAwait(false);
+        var bidi = await BiDi.ConnectAsync(options =>
+        {
+            configure?.Invoke(options);
+            options.UseWebSocket(webSocketUrl);
+        }, cancellationToken).ConfigureAwait(false);
 
         return bidi;
     }