Please add additional 2FA methods besides authenticator apps. Please add: SMS and/or physical keys (U2F, FIDO2, etc.).
It looks like SSO is an option only for the highest tier plan. Those on a plan below that could really use several options for 2FA. Authenticator apps are fine, but not everybody likes them.
Adding additional 2FA options will increase the likelihood of people adopting 2FA, thereby increasing security, thereby decreasing the likelihood of people having their Retool account passwords stolen, thereby reducing data getting stolen, thereby reducing Retool looking bad collaterally. 
