Pslams,
Also in that post is a process to force enable DirectX 12 - did you try that yet? Reposting here for your convenience.
If that doesn’t work we can also try forcing it and see if it takes.
- Open the Battle.net app and go to Settings
- Click Game Settings
- Check Additional command line arguments for World of Warcraft
- Type in -d3d12
- Click Okay and launch the client