Hello.
Welcome to the Microsoft Community.
Based on your description, the unresponsive "Hamburger" Menu in SharePoint Online on Android tablets is likely linked to a recent UI update or compatibility issue affecting touch input in the browser.
In situations like this, I'd recommend:
- Update the Android WebView and Chrome: SharePoint's web-based UI on Android relies on the system WebView or Chrome rendering. Ensure they are fully updated via the Google Play Store.
- Test in another Browser.
- Enable Modern Experience (if not already): From the site's settings > "Site Information" > "View all site settings" > "Manage Site Features" > enable Modern Lists and Libraries.
Let me know how it goes.
Best Regards,
Daniel Coy
Microsoft Community Support