UnauthorizedAccessException

[esward]

I am using VS 2022 17.13.6 version and trying to upgrade projects from .NET framework 4.8.1 to .NET 9.0.
If I try to upgrade any project, I keep getting this error for project files which I couldn't figure out why the UnauthorizedAccess exception is thrown though I am running VS as Administrator. Posting here as I couldn't find this issue reported by any one over the communities.

System.UnauthorizedAccessException, at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.File.InternalCopy(String sourceFileName, String destFileName, Boolean overwrite, Boolean checkHost)
at Microsoft.UpgradeAssistant.Transformers.ProjectSdkStyleTransformerBase.d__3.MoveNext() in D:\a_work\1\s\src\engine\Transformers\Project\ProjectSdkStyleTransformerBase.cs:line 47
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.UpgradeAssistant.Transformers.ProjectSdkStyleTransformer.d__0.MoveNext() in D:\a_work\1\s\src\engine\Transformers\Project\ProjectSdkStyleTransformer.cs:line 32
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.UpgradeAssistant.Operations.Operation.d__13.MoveNext() in D:\a_work\1\s\src\engine\Operations\Operation.cs:line 448
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at Microsoft.UpgradeAssistant.Operations.Operation.d__10.MoveNext() in D:\a_work\1\s\src\engine\Operations\Operation.cs:line 305