Thank you for your help. I was able to figure this out after many, many attempts. Turns out it was a Windows glitch, and not so much a PowerEdge issue. What I had to do was remove all the drives except for the one that I was installing Windows Server 2019 to. Once I had it down to just one installed drive, Windows installed with no other concerns. Once Windows Server 2019 was installed I plugged in all of my other drives and now the entire system is working correctly. I hope that this helps someone else with the same concern. 
Hello, I am hoping that someone here might be able to lend a hand in helping me to figure out what is going on. I'm trying to install Windows Server 2019 on a R620 that has two HP 500GB sas HDD in Raid 0 installed. I've got my .ISO file on a USB drive and the unit picks up the USB drive and starts the install correctly. When I get to the "Where do you want to install Windows?" page, the raid 0 array is correctly displayed as a choice for a single 930.5 GB hard drive. This is where I am running into my issue. When I choose the 930.5 GB drive and click on next, I get an error message that states "We couldn't create a new partition or locate an existing one. For more information, see the Setup log files." First question, where do I find the setup log files, and second question, does anyone have any idea what I am doing wrong? Is it because they are sas drives? I've tried both Bios and UEFI - no go on either option. I've checked my PERC H310 firmware and it is up to date with version 20.13.3-0001, and driver version 6.805.03.00. I've also got a R610 unit that may have had something similar going on, but before that made me pull my hair out, I removed the CD drive and replaced it with an SSD adapter that took its place and installed ProxMox on that unit on the SSD and only used that servers raid for VM storage. I don't have another SSD or CD adapter tray to try right now, plus I would like to figure out how to install the OS to the Raid array if at all possible. Please let me know if you have any ideas. So far I've spent days on this and I'm only learning what it isn't, not what the problem is. Stuff like this takes forever when you have a 5 to 10 minute boot time each time you want to try something new.
PowerEdge R620 Windows Server 2019 install with unit equipped with PERC H310