I have Kasikorn, Krungsri and BKK.
The Kasikorn app has worked flawlessly for years, and I never had to get a face scan. I make transfers over 50K every month with it.
The Krunsri app has worked okay for a few years, then I started getting messages that I needed to go in and get scanned, and then about a month ago the app quit working altogether and the screen indicated I had to go in and get scanned, so I did, they turned in on and no problems since. I make transfers over 50K a couple times a year with it.
I do not use the BKK app, because it is a joint account, and I was lead to believe I could not use the app with a joint account.