Formatting issues in Word Microsoft 365 Copilot online.

This usually happens because Microsoft Word Online doesn’t fully support advanced formatting like desktop versions, so first open the file in desktop Microsoft Word and update the table of contents there. Also check that all your headings still use proper “Heading 1, 2, 3” styles and remove any manual page numbering you added earlier becuase that often breaks TOC syncing. If you must stay online, try clearing formatting and reapplying styles, but honestly its a bit buggy sometimes so desktop fix is more reliable.