Simple Membership and Wordfence Login Security seem to be incompatible. Is there an alternative to the 2FA function?

If you turn on 2FA in Wordfence Login Security while Simple Membership is turned on, you will not be able to log in. If you are locked out, you can re-enter by renaming the Wordfence Login Security folder using FTP and disabling it.

If you are using Simple Membership and cannot use Wordfence Login Security but want to use 2FA when logging in, you can use All-In-One Security’s 2FA function (for now). However, All-In-One Security has a lot of functionality overlap with Siteguard WP Plugin which I also have it installed, so be careful when activating them at the same time. (Do not launch the same function from multiple plugins)