Authenticate User via OTP

Use-case:
- Moving users from an existing product to new Product.

Steps I'm taking:
- I have been trying to adapt One-time password method to make it easier for existing users to login to new product.
- How?
- Using Authy to generate send OTP (check user Exists)
- After Phone / OTP verified, find User.
- Login user with then I used sign_in(User1)

Am I setting myself up for any issues?
- I tried this on bare-bone Jumpstart, however I got an error about current_account (which I might be able to resolve later).

Hard to say without some more details. 2FA is something I've been meaning to add to JSP as well.