[Python] Not able to execute DAX on PowerBI in .Net through ADOMD Client

I have the below python code which works perfectly on any Workspace by executing the DAX on powerbi Dataset, whereas i converted this in .Net, but its failing and giving Not Found error. Can someone please help here

Python

import clr
clr.AddReference(r"C:\Program Files\Microsoft.NET\ADOMD.NET\160\Microsoft.AnalysisServices.AdomdClient.dll")
from pyadomd import Pyadomd

# Power BI connection details
conn_str = (
"Provider=MSOLAP;"
"Data Source=powerbi://api.powerbi.com/v1.0/myorg/WorkSpace1;"
"Initial Catalog=TEST"
)


# Run DAX query
def run_dax_query(query: str) -> pd.DataFrame:
with Pyadomd(conn_str) as conn:
with conn.cursor().execute(query) as cur:
df = pd.DataFrame(cur.fetchall(), columns=[col.name for col in cur.description])
return df


.Net

public string ExecuteDaxQuery(string daxQuery)
{
string workspaceConnection = _config["PowerBI:XmlaConnectionString"];

using var conn = new AdomdConnection(workspaceConnection);
conn.Open();

using var cmd = new AdomdCommand(daxQuery, conn);
using var reader = cmd.ExecuteReader();

var results = new List<Dictionary<string, object>>();
while (reader.Read())
{
var row = new Dictionary<string, object>();
for (int i = 0; i < reader.FieldCount; i++)
{
row[reader.GetName(i)] = reader.GetValue(i);
}
results.Add(row);
}

return System.Text.Json.JsonSerializer.Serialize(results);
}

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