Battlenet mobile

I had both my accounts on one authenticator, i was promtred to install this app on my phone and it promted me to use for authentication so i did, prob is there is no feature to use it for both accounts like the authentictor. I also can only attach one account to my phone number, please fix this. you have told us for years to be sure to authenticate , now you took it away for people using 2 accounts, are we going to see this fixed as i cannot authenticate my second account and if i cannot do this i cannot alter or make payments for membership. very frustrating tech cannot help, why fix somthing that was working for this crap.