I use an iPhone (out of choice) but what MFA doesn’t work on android?
That's your personal decision though, you don't need a flagship android phone to have the latest versions of android. I pretty much never spend more than $100-150 for android phones and they always support all the normal MFA apps.
I mean, I still wouldn't trust Sony even if it give a blood oath (they used to abandon flagships after 16-18 month form release!), but there are also more reputable vendors.
They all work fine, you just have to be on a relatively current version of android, and that's dictated by which versions the apps enable support for and not anything inherent to android in general. The idea that MFA apps don't work for half of phone owners is silly.