What Grant Type To Use For Passwordless

I understand that if my tenant was created after June 8, 2017, that I can no longer use the legacy grant type (oauth/ro). Which grant type should I use for passwordless auth (SMS)?
I’m aware of the client gran types documentation (Application Grant Types) but couldn’t find any information regarding the passwordless implementation. Thank you for your help!

I guess hosted login pages are the only way to implement passwordless auth if you created your tenant after June 8, 2017. See here for more info Auth0 Universal Login. Hope this will help someone in the future.