So I upgraded my RAM in my Mac mini to 2 16GB RAM modules for a total of 32GB RAM. However, once turning the Mac Mini (Late 2018) on, the system information only shows 16GB of RAM and not 32GB. Can someone aid me with figuring out how to make it recognize both modules?

I did call Apple Support and they told me that this unit must be brought in for the RAM to be useable for beyond 16GB. Is this true or does anyone know how to make it show all 32GB without taking it into a Mac Authorized support facility? Thanks for your help. - Allen