M-key SSD but Sata Slot?

Differences Between M2 Cards M2 Slots Keys Sizes and Types m 2 slot key m • SATA or PCIe x2 fits “B” key for SSD, WWAN, other non-storage devices • PCIe x4 up to 4GBs fitting “M” key modules for high performance SSD m24 slot There are some mechanical keys defined for SSDs For example key B pinout supports SSDWWAN: 1x SATA SSD or 1x, 2x PCIe SSD Host

m2 expansion slot 2 slot and my only PCIe slot is occupied by the GPU (I tried searching for an adaptor but all of them are either SATA to SATA SSD or PCIe M