Got a used HP Probook laptop. Just needs a new drive. HP specs say it has an m.2 2280 slot. So that’s what I ordered. Guess I needed to look closer.
edit: Thanks for all the info, guys. Different types of keys are explained here. Gonna have to look for a sketchy no-name brand.
The port is a B key m.2, while the ssd is an M key m.2
B keys are used in SATA m.2 ssds, while M keys are pcie nvme m.2 ssds. You bought an nvme m.2 ssd, but needed a sata m.2 ssd.
(You can tell by how there are 28 pins on that side of the port, and 29 on the ssd. That matches b and m keys, respectively)