Yes, any user can register using a joint bank account.

While your sFOX profile will be registered under your personal name, your bank name may be registered under your personal name or the joint name on the bank account.

If you are over 18 and are adding a joint bank account with a parent or guardian (which was opened when you were a minor), you may experience an issue in linking the account. If this is the case, you may need to contact your bank in order to include yourself as a primary owner of the account.