Hi,

I would need more information about the server. How many processors do the server have? What is the processor model? What memory module are you trying to install, do you have the specifications? Are the server's firmware, iDRAC and BIOS up to date? 

Here's the memory installation guide. https://dell.to/4aYVeu4. In the guide, it provides the requirement and installation population. Here's the memory installation guideline: https://dell.to/3yTvWjE