Question RAM shows up in BIOS but not in Windows

[origilgun]

I had 2x8GB sticks in my computer and I decided to buy 2 additional modules and add them (same model exactly).

My motherboard Asus H170m-Plus recognizes the new modules (shows up in BIOS) but they are not showing up in the total memory in the operating system which is Windows Server 2019.
System properties shows only 16GB total but if I run CPU-Z for example it recognizes all 4 sticks of 8GB.

https://imgur.com/a/4LPwJ10

View: https://imgur.com/a/4LPwJ10


Am I missing some setting in my BIOS?

Kindly assist.

 

[rgd1101]

check msconfig max ram?
check resource monitor?

 

[origilgun]

check msconfig max ram?
check resource monitor?

msconfig max ram not checked.
resource monitor shows both Total and Installed 16GB.