Windows Defender won't update?

I recently updated Windows 10 from 1803 to 1809, when I go to Windows Defender, everytime when I click "Check for updates" it doesn't check for updates or it doesn't says "Up to date", etc, any ideas?
i have my uploaded video attached
https://ln.sync.com/dl/3e55d41a0#abn5mqve-abeas88p-g2ptn4kx-wzgnuafa

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