Hi @taylorg,
Thanks for reaching out to the Auth0 Community!
To clarify, are you attempting to go through the sign-up flow for a user that already exists in your database? If so, an error is expected behavior as the Get User script is finding a record for the user and sees this sign-up as an attempt to create a duplicate record. Instead of signing up would you mind trying to login with the credentials stored in your external database?
If this is not the issue, any additional information you can provide about the errors you’re seeing would be helpful.
Thanks,
Matt