Receiving security codes to iPad in addition to phone

When signing into an online banks site for example a security code is texted to my phone. I used to receive this code on both my phone and iPad. For awhile now I no longer get them to my iPad. I did change carriers on my ipad(it does have cellular service) but I’m pretty sure I stopped receiving the codes prior to that. This is true of all sites I visit that require authentication with a code.

what’s happened here? If fixable, how. I’d love to get the codes texted to phone, iPad and MacBook if possible.