Seeing as we have to guess the issue, as more details are not expressed, I take a wild stab at it. Google Play System Update is Dec 2019.
What happens when you press on where that date states December 2019?
Because mine is updating fine.
This is updated by Google itself..
Tap on it once and see if the update starts [e]1f609[/e]
Download the file manually, and try installing that?
Try the following,
Clear the App info Cache and App info Storage for all 4 items
Google Play services
Google Services Framework (Search in Setting for this)
Restart the phone.
It may take a while for Google to rebuild its Services, Playstore etc.
Go through at least one full charge cycle from less than 50% Battery to give it time to do that.
See if that helps.
OnePlus Nord: Important Updates and Open Sales Guide [IN]
by Kale W., 2020-08-03