Windows defender not updating and also not turning on

Hi,

Windows 10's automatic updates have stopped. Windows defender is automatically turned off. PFA


Searched for the error code and got this 0x80070643

Netframework repair tool showed this

Followed all steps excluding point 4 as mentioned here

But the result is the same. Any help?

Thanks
 
I was also in similar situation when didn't update for the entire 2020 yr.

Not sure but seems I followed these two links and it worked: (as these were in my ff bookmarks for the said period)

 
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