Hi @strvtw !
First, this is a French community so feel free to write your messages in French! If you would prefer to keep your conversation in English, we also have an English community here : English Community
When you buy a domain on Shopify, you are asked to verify it by clicking a link into the verification email you receive. If it is not done within 15 days, your domain will be suspended.
If you forgot to verify your email, the first thing to do is try to find the verification email in your inbox, do not forget to check in your spam folder. If you can't find it, you still can resend another verification email by going to your Admin > Online Store > Domains > Click on Manage next to your domain. You should see a yellow banner with a button that says "Resend verification email" or something similar.
Once you get the email, you can click on the link inside to verify your domain and it should then be unsuspended.