Simple Example binding the dog API? | FSharp | Page 1

I'd like to bind the dogapi in F#. But I'm having trouble converting my C# example into an Fsharp example. I don't know what to do about GetFromJsonAsync<List<Dog>>. Normally this takes a List<Dog>> class that looks like this

public class Dog
{

    public string Id { get; set; }

    public string Url { get; set; }

    public int Width { get; set; }

    public int Height { get; set; }
}

But I'm not sure I can do this in F#? I'm also getting errors like

0>Program.fs(27,1): Warning FS0020 : The result of this expression has type 'Async<'a>' and is implicitly ignored. Consider using 'ignore' to discard this value explicitly, e.g. 'expr |> ignore', or 'let' to bind the result to a name, e.g. 'let result = expr'.

So I might be going down the wrong path using my C# code as a base. Does anyone know the best way to do this in F#?

open System
open System.Net.Http
open System.Net.Http.Headers
open System.Net.Http.Json
open System.Text
open System.Text.Json

let private baseUrl = "https://api.thedogapi.com/v1/"
let mutable private httpClient: HttpClient option = None

let initializeHttpClient (apiKey: string) =
    let client = new HttpClient(BaseAddress = Uri(baseUrl))
    client.DefaultRequestHeaders.Accept.Clear()
    client.DefaultRequestHeaders.Accept.Add(MediaTypeWithQualityHeaderValue("application/json"))
    client.DefaultRequestHeaders.Authorization <- AuthenticationHeaderValue("X-API-Key", apiKey)
    httpClient <- Some client
    
let getRandomDogAsync (client : HttpClient option) : Async<Dog> = async {
    match client with
    | Some client ->
        let! dog = client.GetFromJsonAsync<List<Dog>>("images/search") |> Async.AwaitTask
        dog[-1]
    | None ->
        failwith "HttpClient not initialized. Call initializeHttpClient first."
}

initializeHttpClient "MyAPIKey" |> getRandomDogAsync |> Async.AwaitTask

#Simple Example binding the dog API?