The only motherboards I can find only supports up to 512 GB and not the full 1 TB for NVMe SSDs. Example :
Motherboard: SRock Z390 Phantom Gaming SLI/ac ATX w/ 802.11ac Wi-Fi, ARGB, USB 3.1, 2 PCIe x16, 4 PCIe x1, 6 SATA3, 2 M.2 SATA/PCIe
Storage: Ultra M.2_SSD (NGFF) Module Support List
Vender: Intel
Size: 512GB
Interface: PCIe3 x4
Length: 2280
Part No.: 660P-SSDPEKNW512G8 NVME
Motherboard: SRock Z390 Phantom Gaming SLI/ac ATX w/ 802.11ac Wi-Fi, ARGB, USB 3.1, 2 PCIe x16, 4 PCIe x1, 6 SATA3, 2 M.2 SATA/PCIe
Storage: Ultra M.2_SSD (NGFF) Module Support List
Vender: Intel
Size: 512GB
Interface: PCIe3 x4
Length: 2280
Part No.: 660P-SSDPEKNW512G8 NVME