Samsung's phones don't have high enough immunity to electromagnetic interference, so if the magnetism is too strong, it can interfere with wireless charging. 

Pitaka MagEZ case for S22U doesn't work with Samsung Wireless Charger Stand 15 W because of electromagnetic interference. 

So we did adjust the magnetic strength of the S23Ultra MagEZ Case to fit more wireless charging machines and give you a better experience. The S23Ultra MagEZ Case will still work with Pitaka's MagSafe-adapted devices, please don't worry :)