the only thing other things you could try. Checking the app is up to date, go to the play store enter bangkok bank and it will either say "open or update"
Delete the app and reinstall it, this is last worse case option.
If you have a partner install the bangkok bank on thier phone and see if it works
what happens? Does it remain a red image? If so your picture in the system is not being matched to your face, maybe best to go too your local branch and see if they can start again, if you have problems communicating phone the BBank helpline who have good English and let them explain the problem.
I have it on my android phone, it's only needed over 50kThb so I keep to below if I can, because it's really painful, what issue are you having is it installed amd registered on the phone ok? I seem to remember I had to have my picture taken at the bank. Give more details.
this group is help anyone with a question in Thailand, how lazy they are is immaterial. Your reply could be read by alot of people who (unbelievable) believe you.