Review on FDGAO 20W Max Qi-Certified Fast Wireless Charging Stand for iPhone 12/SE 2/11/X/XR/8, ⚡️ AirPods & 15W Wireless Charge Docks for Samsung Galaxy S21/S20/S9/Note 20 (NO AC Adapter) by Kelly Dorsey

Doesn't work with Samsung Galaxy S21 Ultra. The phone immediately gives an error message that this charger is not compatible with my phone. And yes, I used the QC 3.0 adapter and made sure it charges quickly directly from the cable. I also checked that fast wireless charging is enabled. Other reviewers say it works with their S21 and the only thing I can tell from that is that they don't use an Ultra. I don't think this cell is defective simply because it charges at the standard rate, it just doesn't charge fast.