Make sure the following modules are registered in IIS modules: AspNetCoreModule & AspNetCoreModuleV2

you can install them by running the following commands:

open cmd as admin

navigate to inetSrv location C:\Windows\System32\inetsrv run: appcmd.exe

install module /name:AspNetCoreModule /image:%windir%\system32\inetsrv\aspnetcore.dll

install module /name:AspNetCoreModuleV2 /image:"%ProgramFiles%\IIS\Asp.Net Core Module\V2\aspnetcorev2.dll"