How to Devise and Devise_token_auth share the same parameters?

After signing up a user with Devise, it stores the email but tokens are blank, the tokens get created if signed up using devise_token_auth.

Is it possible to force devise to use devise_token params to authenticate and vice versa?

Start with the two signup flows described: Devise and devise_token_auth. Compare how each stores the email and creates tokens, then determine whether shared authentication parameters are intended and what compatibility behavior would be considered complete.

Written by the indexing model from the issue text.