I tested this module with project/tfa in Drupal 8 and found that these two modules are not commensurate. Having both on means that you are prompted twice to enter authentication codes.
Given that project/tfa has an API for adding authentication methods that follow the standards in authentication via tokens, it would be great if this module could be written as an extension of project/tfa.
If you choose not to, that's fine.
I will leave this comment here to alert others that this module is not currently a plugin for project/tfa and cannot be used at the same time as project/tfa.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
There was a long discussion here:
https://www.drupal.org/project/tfa/issues/2930541
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Create "Email one-time-code" Validation Plugin & related Setup Plugin
Closed: outdated
The conclusion is the following module, which only works for v1.x of tfa.
https://www.drupal.org/project/tfa_email_otp →