You should have received an e-mail almost immediately either with your ticket attached or with instructions to recover it from the Eurostar site.
Check your Spam folder just in case:
If you do not receive it you should contact customer service for advice (by e-mail). Include your pass number and when your booking is for in your title so they can prioritise.
These reservations are not refundable so do not order a new one unless you are advised by customer service to do so.
Thank you so much for that!
I went through the robot costumer service and I had no answer. Do you know the correct email for it?
The best way to contact customer service is via this form:
https://eurail.zendesk.com/hc/en-001/requests/new