What does "A specified login name already exists for this email." error from Tessitura mean and how can I fix it?

A specified login name already exists for this email. Please fix this in Tessitura and resend the job.

When this happens, the transaction in Stripe was completed and the customer experience was perfect. They have no idea there was an issue, which is good.

This happens when the box office previously sets up an account for the user but the API REST user doesn’t have access.  You need to go into Tessitura and fix it. Then, you can use the Resend button on the 2 Account Dashboard.

Resource: web/registration
Response: "Code": "DUPLICATE_ENTITY"