Bing Webapi fails in Blazor but not in ASP.NET Core

This code works in web but not in Blazor - please suggest a solution. I could see errors in console.

Here is correct website that works:

https://locationsearch.azurewebsites.net/Calc

Note: please get free Bing Maps key from MS Website.

The code is failing:

Uri elevationReq = new Uri(string.Format("https://api.open-meteo.com/v1/elevation?latitude={latitude}&longitude={longitude}"));

Incorrect String Format Exception

View:

@page "/"@using Newtonsoft.Json;@using Microsoft.AspNetCore.Components.Forms@using System.Text;@using System.Net.Http.Headers;<h1>Counter</h1><EditForm Model="@submitActivity" OnSubmit="@Submit"><div class="row"><div class="col-md-3"><p>Location</p></div><div class="col-md-4"><input placeholder="Location" @bind="@loc" /></div></div><br /><div><button type="submit">Submit</button></div><div>    @errmsg</div><br />    @latitude<br />    @longitude<br/>    @elevation</EditForm>@code {    private string loc; string errmsg = ""; string time1 = "";     double latitude = 0.0; double longitude = 0.0; double elevation;    string time2 = "";    private ACTIVITY submitActivity { get; set; } = new();    public class ACTIVITY    {        public string Dummy { get; set; }    }    private async Task Submit()    {        string key = "Au7sMtQzyQZRzuQ2krOIbZg8j2MGoHzzOJAmVym6vQjHq_BJ8a1YQGX3iCosFh8u";        string query = loc;         using (HttpClient client = new HttpClient())        {            string timez = "";            string final = "";            string timezone = "";            string checknull = "";            string time3 = "";            string timef = "";             Uri geocodeRequest = new Uri(string.Format("http://dev.virtualearth.net/REST/v1/Locations?q={0}&key={1}", query, key));            client.BaseAddress = new Uri(geocodeRequest.ToString());            client.DefaultRequestHeaders.Clear();            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));            HttpResponseMessage response1 = null;            try            {                response1 = await client.GetAsync(geocodeRequest);                string jsonstring = await response1.Content.ReadAsStringAsync();                // Parse the JSON response to extract the address                dynamic data1 = Newtonsoft.Json.JsonConvert.DeserializeObject(jsonstring);                var result1 = data1.resourceSets[0].resources[0];                latitude = result1.point.coordinates[0];                longitude = result1.point.coordinates[1];                Uri elevationReq = new Uri(string.Format("https://api.open-meteo.com/v1/elevation?latitude={latitude}&longitude={longitude}"));                client.BaseAddress = new Uri(elevationReq.ToString());                client.DefaultRequestHeaders.Clear();                client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));                HttpResponseMessage response2 = null;                response2 = await client.GetAsync(elevationReq);                string jsonstring2 = await response2.Content.ReadAsStringAsync();                // Parse the JSON response to extract the address                dynamic datael = Newtonsoft.Json.JsonConvert.DeserializeObject(jsonstring2);                elevation = datael.elevation[0];            }            catch (Exception e)            {                loc = "";                timez = "";                errmsg = "Invalid Location";            }        }    }}