Write text failed - Synthetizing keys failure

In Excel I try to a column of data to a new column. After selecting the data with SendHotkey (Ctrl+Shift+down) activity I use the Excel shortcut Menu SendHotkey (Shift+F10) then attempt to enter ‘C’ ( Copy ) with SendHotkey (“c”) activity.
The last SendHotkey is giving errors:
Synthetizing keys failure.
Write text failed.

Source: Send Hotkey 'excelCopy

Message: Write text failed.

Exception Type: UiPath.Core.ElementOperationException

An ExceptionDetail, likely created by IncludeExceptionDetailInFaults=true, whose value is:
UiPath.Core.ElementOperationException: Write text failed. ----> System.Runtime.InteropServices.COMException: Synthetizing keys failure.
at UiPath.UiNodeClass.WriteText(String text, UiInputMethod inputMethod)
at UiPath.Core.UiElement.WriteText(String text, InputMethod method)
— End of inner ExceptionDetail stack trace —
at UiPath.Core.Activities.TaskAsyncCodeActivity`1.EndExecute(AsyncCodeActivityContext context, IAsyncResult result)
at System.Activities.AsyncCodeActivity.System.Activities.IAsyncCodeActivity.FinishExecution(AsyncCodeActivityContext context, IAsyncResult result)
at System.Activities.AsyncCodeActivity.CompleteAsyncCodeActivityData.CompleteAsyncCodeActivityWorkItem.Execute(ActivityExecutor executor, BookmarkManager bookmarkManager)

I saw a reference to this being fixed in 18.1 but I am running 18.4.

Are there any further details as to what is behind this issue? Is it still a known bug?

Additional information:

Excel for Office 365 MSO (16.0.11328.20156) 64-bit

Workflow segment: