If you find the Facebook activity log search not working, close the platform where you usually access your account. Now, check your web browser or the Facebook app is up-to-date; if not, do it before restarting the program. And also, make sure your device isn’t running with any third-party programs while running Facebook. Hope your issue will get resolved!
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Here are a few things you can try: - Log out of Facebook, - Clear cookies and cache, if you're using a computer; - Make sure you're using the most updated version of the app or browser; - Restart your computer or phone; - Uninstall and reinstall the app, if you're using a phone; - Log into Facebook and try again.