"Something went wrong" error when you try to sign up after already signing up

[mjtribble]

400 error whenapli/send_magic_link endpoint. Invalid credentials Was able to reproduce locally and in prod

Repo Instruction

1. Start back end and front end apps
2. Enter fullname and phone to signup
3. Retrieve and navigate to confirmation link. Link is printed in the backend logs
4. Navigate back to signup screen
5. Enter same name and phone

Expected:

I suppose I'd expect to be redirected to the survey I have not yet finished.

Actual:

400 error and user facing, something went wrong message.