Upgrade / troubleshoot SignalR from .net core 2.1 to .NET core 3.1

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Upgrade / troubleshoot SignalR from .net core 2.1 to .NET core 3.1
I have two code branches in git. One is the old 2.1 .NET core branch. The other is the upgraded .NET Core 3.1 branch. Everything is working in the upgraded branch except for the Signal R communication from server to client. The Signal R communication from client to server is working on the upgraded project. Just need some help troubleshooting to resolve the issue with server to client communication.
The problem occurs at about 50 second mark in this video. [login to view URL] Signal R successfully sends the message to the server from the client. But then the notifications from the server to the client are not received and the progress bar / upload notification never shows in the UI.
The working version is on the core21 branch. The branch with the bug is on the master branch.
In order to run the project just modify appsettings file and create a new database in sql server. The app will create the schema necessary in the db and then prompt for an admin password on first run. Follow the steps in the video posted to reproduce the issue. You will need to upload a shape file. You can download a sample shape file from here - [login to view URL]
There is other work I need completed after this such as getting nhibernate second level cache working with Redis. Also integration of licensing library. Impress me with this project and I will offer more work.
Skills:
C# Programming
, .NET
, ASP.NET
, Microsoft SQL Server
, Angular.js

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