Entity Framework 6.4 throwing NullReferenceException with Azure Functions V3

I'm using Azure Functions V3 (.Net Core 3.1) and trying to call an Entity FrameWork class built using EF 6.4 (.Net 7.2) and Entity Framework is throwing a NullReferenceException. The same call succeeds while using .Net Core console app instead of Azure Function. Appreciate your help here.

Here is my function definition:

namespace FunctionAppV32 
{
    public static class Function1 
    {
        [FunctionName("Function1")] 
        public static void Run([TimerTrigger("0 * * * * *")]TimerInfo myTimer, ILogger log) 
        { 
            log.LogInformation($"C# Timer trigger function executed at: {DateTime.Now}"); 

            var cstr = ConnectionString2.BuildConnectionString(); 
            FlighterSIEntities entities = new FlighterSIEntities(cstr); 

            foreach (var x in entities.TGBotComplexVectorParamSettings) 
            { .... }
        }
    }
}

The exception is thrown while accessing entities.TGBotComplexVectorParamSettings in for loop.

Exception Stack Trace:

System.NullReferenceException HResult=0x80004003 Message=Object reference not set to an instance of an object. Source=EntityFramework StackTrace:

at System.Data.Entity.Core.EntityClient.EntityConnection.GetStoreConnection(DbProviderFactory factory)
at System.Data.Entity.Core.EntityClient.EntityConnection.ChangeConnectionString(String newConnectionString)
at System.Data.Entity.Core.EntityClient.EntityConnection..ctor(String connectionString) at System.Data.Entity.Internal.LazyInternalConnection.Initialize() at System.Data.Entity.Internal.LazyInternalConnection.CreateObjectContextFromConnectionModel() at System.Data.Entity.Internal.LazyInternalContext.InitializeContext() at System.Data.Entity.Internal.InternalContext.Initialize() at System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType) at System.Data.Entity.Internal.Linq.InternalSet1.Initialize() at System.Data.Entity.Internal.Linq.InternalSet1.GetEnumerator() at System.Data.Entity.Infrastructure.DbQuery1.System.Collections.Generic.IEnumerable.GetEnumerator() at FunctionAppV32.Function1.Run(TimerInfo myTimer, ILogger log) in D:\src\RnR-ExperimentationTools\src\TGBot\FunctionAppV32\Function1.cs:line 20 at Microsoft.Azure.WebJobs.Host.Executors.VoidMethodInvoker2.InvokeAsync(TReflected instance, Object[] arguments) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\VoidMethodInvoker.cs:line 20 at Microsoft.Azure.WebJobs.Host.Executors.FunctionInvoker`2.d__10.MoveNext() in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionInvoker.cs:line 52

I was able to resolve exactly same issue with updating below packages to mentioned versions. Hope it helps to you or anyone facing the same issue.

• EntityFramework to Version=6.4.4
• Microsoft.EntityFrameworkCore to Version=3.1.6
• Microsoft.Extensions.Configuration to Version=3.1.6

Kindly check.