app wont run unless renamed

Question

I have an application that won't run unless it is renamed. It is a .NET 4.7 application that is launched as a background application used to communicate from another application to the SQL Server database via pipes. I run the application in an admin account and MS Defender is used. I tried to make it an allowed application in the firewall, but it didn't work. When I launch the application, the task manager briefly shows "DM.exe Suspended" and closed. The event viewer indicated an exception with XML and DotNet. I simply rename the app and config file from DM.exe and DM.exe.config to DM2.exe and DM2.exe.config and the app runs fine.