Bangok Bank cardless withdrawals also offer Aeon Bank and one other as options, but I read it you would have to use the K Bank app at a Bangkok Bank ATM to withdraw from your K account?
I first noticed it a couple of weeks ago but don't have a Kasikorn account but wondered whether it worked the other way.
Found myself a Kasikorn ATM and yes, the Bangkok Bank option is there so I carried on with my Bangkok Bank app. Got the QR code up on screen but got an "Invalid Code" message on my phone when I scanned it. So close but no cigar yet, for me anyway.