If you’re also facing the problem of Timeline feature not working, Here some solutions you may apply to fix this issue. First, open Settings > Privacy > Activity history make sure “Let Windows collect my activities from this PC” and ” Let Windows sync my activities from this PC to the cloud” is check marked.   Also Under Show activities from accounts, ensure that your Microsoft Account is selected and the toggle is set to the On position. Now restart windows and click on timeline icon on your Taskbar, Then click Turn on the option under see more day   And now it should be working fine. If you still don’t see the Timeline icon, right-click on the taskbar and make sure the Show Task View button is selected.   Some Other solutions you may try: Open Settings app, go to System > Shared experiences. Here toggle on Share across devices and set I can share or receive from to Everyone nearby as shown image below.  

Still need help lets tweak windows registry. Press Windows + R, type regedit and ok to open the windows registry editor. First backup registry database then navigate to the following key. HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\System Here ensure that the value of the following DWORD (32 bit) values are set to 1:

EnableActivityFeedPublishUserActivitiesUploadUserActivities

If you didn’t find any key then right click on System -> New – > DWORD (32bit) Value and name it EnableActivityFeed. On the same way create two more keys and name them  PublishUserActivities, UploadUserActivities Double click on the newly created key and set its value 1. That’s all now restart windows and check the Windows timeline working properly and started collecting your previous tasks.

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