Please, i just got this issue. My is msi b550 tomahawk. Thank you so much!!!!!
Greetings! After you initialize the disk, you need to right click on it and pick New Simple volume and set it up to work with your PC. Here is a guide on the whole process: https://community.microcenter.com/discussion/3289/how-to-initialize-and-format-a-newly-installed-secondary-drive-in-windows-10