Getting System.Runtime.InteropServices.COMException (0x80004005):Unable to create specified ActiveX Control

The full exception as below.

[01] WINWORD -- An exception was thrown with the following information: System.Runtime.InteropServices.COMException (0x80004005): Unable to create specified ActiveX control. at Microsoft.Office.Core.ICTPFactory.CreateCTP(String CTPAxID, String CTPTitle, Object CTPParentWindow) at Office.TaskPaneManagement.Impl.CustomTaskPaneFactoryWrapper.Create(String title)

1. Is it related to any .Net framework? or related any specific versions of .Net framework? or it is because of .Net framework updates?
2. More clients are reporting that they are not able to see the custom task pane within word.
3. all are having 4.8 version of .Net Version installed.

Anything that we need to take care from the code perspective.

Also please do suggest the workaround if available for this issue.