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.

Am I missing some BIOS setting?

Thanks in advance.

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[phillpower2]

Windows Server 2019 is for IT specialists and business users and not for personal use which is the only type of user that we are permitted to help.

As per the PCHF Terms and rules

1. PCHF can not and will not offer advice for business use or financial gain. PCHF only offers assistance for personal use.

Legitimate users of Microsoft Server can only be assisted by either their IT department or by Microsoft directly, this thread will be closed as per the PCHF Terms and rules.