[cbzoiav]

There are a huge number of app based solutions. Enterprises are against them because they can't expect their employees to install 20 different apps for 20 different vendors + the cost of reviewing and onboarding them.

So you either need to support SMS or several of the major 2FA app providers including the crappier implementations like Microsoft authenticator.

[dymk]

I work at an "enterprise" company and I'm not expected to install 20 different apps. Duo is just one example, but it supports both push based 2FA and onetime tokens, and those two modalities cover every vendor integration and SSO we have. There's really no excuse to be using SMS nowadays.