Can't pair Schlage lock

I have an FE599 that I’m trying to pair to my Smartthings hub, and it’s not working.

Specifically, I enter the PC and press Schlage 0 once it’s ready, and it flashes orange once or twice, and then beeps and flashes red 6 times.

I did a factory reset on the lock, and have just replaced the batteries with brand new ones.

Any ideas what I should try?

Paul

What’s your distance from the lock to hub? When pairing it’s usually necessary to be relatively close (15’ or less).