The MSI B550M PRO-VDH excludes the 3400G and 3200G on its AM4 socket

The MSI B550M PRO-VDH uses the AM4 socket and supports AMD Ryzen 5000, 5000 G-Series, 4000 G-Series, and 3000 series desktop processors — but skips the Ryzen 5 3400G and Ryzen 3 3200G, same as other B550 boards. Those Picasso-era APUs don’t play nice with the chipset’s PCIe 4.0 routing, so MSI leaves them off the compatibility list.