A family of Microsoft word processing software products for creating web, email, and print documents.
I can confirm that ribbon customizations don't show up when Word is started using Automation, although the add-in appears to be loaded.
I'm using Word 2019 32-bit (in Office 2019 Professional Plus) on Windows 10 Home 64-bit. Both are fully updated.
- Word started manually.
- Word started using Automation from Excel.
You can report this problem to Microsoft using File > Feedback > Send a Frown.
This is not what I am seeing using Office 365 with the same build. They will load and operate. I will be able to try with an Office 2016 installation on Sunday.