Since the procedure of opening a bank account & use of debit cards have become simple, it is quite normal to have multiple bank accounts and cards. In fact, the combination of bank accounts and mobile based payment apps like Cash App has made money management simpler and better.
Adding multiple bank accounts & debit cards on Cash App is not possible as of now. But, there is one alternative option. What you can do is to replace your current. To know more information about Cash App Multiple Bank Accounts visit here: https://www.squarecashelps.com/blog/add-multiple-bank-accounts