I have 2 K Bank accounts in one province, one with a card, one without. Both on the K Plus app.
I am spending more time by the coast so I wanted to open a new account - with a card, and linked to the app/internet banking. No problem for the first 2 parts but I was told they couldn't link to the existing internet banking.
Subsequently, I called the (excellent) call centre who informed me that the new account could be linked. I went back to Jomtien K Bank and gently pointed out that it could be done.