Which banks in Thailand allow joint accounts with both partners using PromptPay on their phones?

An expat couple is seeking information about banks in Thailand that allow them to open a joint bank account where both partners can use the PromptPay payment app on their phones. They encountered a limitation at Kasikorn Bank, where only one person can connect to the banking app (K+). Suggestions and experiences regarding other banks with more flexible arrangements for joint accounts and mobile banking options were discussed in the comments.