Firestore not allowing clear text but yet using google sdk for .net

Question

I am using google FireStore as the database as it allows for off line syncing However I am running into this issue with the get command. I no its usually down to https but as I am using the google sdk should that be taking care off?

Error I am getting is

One or more errors occurred. (Cleartext HTTP traffic to MYExtIPAddress not permitted)'

Bare in mind I am using the spark plan unless that doesnt come with https but I would have assumed it did.

I am using the following to access the client

My Using

using Google.Cloud.Firestore;
public const string ProjectId = "mysecretproectId";
FirestoreDb db = FirestoreDb.Create(mysecretproectId);

public async Task<List<InvoiceHeader>> GetInvoices()
    { List<InvoiceHeader> invoiceHeaderList = new List<InvoiceHeader>();
        InvoiceHeader invoiceHeaderAll = new InvoiceHeader();
        try
        {
            Query invoiceHeaderQuery = db.Collection("InvoiceHeader");
            QuerySnapshot employeeQuerySnapshot = await invoiceHeaderQuery.GetSnapshotAsync();
            foreach (DocumentSnapshot documentSnapshot in employeeQuerySnapshot.Documents)
            {
                Dictionary<string, object> header= documentSnapshot.ToDictionary();
                string json = JsonConvert.SerializeObject(header);
                invoiceHeaderAll = JsonConvert.DeserializeObject<InvoiceHeader>(json);
                invoiceHeaderList.Add(invoiceHeaderAll);
            }
        }
      
        return invoiceHeaderList;
}