Like, I got an autofocus adapter so that I can electronically control the focus and aperture of the lens. My Canon EF-S lens doesn't fit into it because it was designed for EF lenses (same mounting ring, but different mechanical dimensions)
So I buy a different Canon lens. It's the wrong type (EF-M) that's not even close to being compatible.
Hopefully third time's the charm 🤦🏻♀️