It finally worked. – Google Smart Lock Review

My problem was with IPad Pro 12.3 first gen with titan key usb. Smart lock would not look for Bluetooth key. For some reason it was sayin plug in key and push button. Tried all steps 10 times nothing worked. I started to sign in with Gmail app instead of smart lock it got to step that said install or open smart lock app. When I pressed open it worked as I got correct window with picture of USB key. I hope that can help if you have the same problem. Good lock(luck).
Review by zaraza6969 on Google Smart Lock.