Under Account settings/ Integrations I've changed the defaults for Word & Excel to open with Microsoft Office Online but the file still open with box previewer.

This is happening on macOS Sonoma and Sequoia / Safari / Chrome / Edge.

I've tried this across three machines with and without box tools.

Things I have tried.

1.Clean MacOS 

2. Different web browsers

3. files have the correct suffix .xlsx and .docx