Issues Connecting to Client's Dust Workspace Setup

hey, I’m trying to set up a new Dust workspace for one of my client. She created it on her side, put the credit card details and connected Notion. Now, on my side, I’m trying to connect to her workspace with her details to set up the workspace. I put the email address, then the password. The next step ask me for a google email, I don’t understand why? Since we didn’t set up the connexion with Google, it doesn’t make sense. (So, I’m stuck at this step)