My understanding is that SSDs cannot be securely erased. They need to be destroyed. They rely heavily on redundant storage capacity and wear-leveling, and overwriting what it presents as the disk gives no guarantee the on-device storage controller has actually overwritten the copies it last wrote vs some alternative for that sector.

Edit: https://kb.iu.edu/d/aiut has links to some manufacturer-specific tools that can properly erase the drive. Supposedly.