Windefender AV Signature Updates Cannot be Scheduled

Hey all!

We have some workstations that we'd like to schedule WD AV Signature Updates on, rather than having them scanned/DL'd/installed on the standard frequency, and we've run into some trouble.

We've used Microsoft's documentation to Enable the following three settings in LGPO editor, to match our needs:

1. Specify the day of the week to check for definition updates

2. Specify the interval to check for definition updates

3. Specify the time to check for definition updates

After turning on and editing those settings, nothing has changed. We're still getting Signature updates multiple times per day, and ideally we'd like them to be Checked/DL'd/Installed once per day, after business hours.

Has anyone else run into this issue? It seems that Windows will not respect the LGPO settings, even though they're all showing as Enabled in the list. I have been sifting through articles and forum posts, but nothing seems to stand out...

These workstations are on Win10 Enterprise LTSC 64-bit, not part of any domain, and we always stay updated. 

Any thoughts/assistance would be greatly appreciated! If there's questions, I'll be glad to answer.

Thanks in advance!