A client is one of your customers. Every project in CloudMove belongs to a client, and every client connects to its own Microsoft 365 tenant.
Your MSP
├── Acme Corp (client)
│ ├── File Server A → SharePoint (project)
│ └── Home Folders → OneDrive (project)
└── Globex (client)
└── Archive Migration (project)
One client = one M365 tenant. If a customer has multiple tenants you want to migrate to, create one CloudMove client per tenant.
From the dashboard, go to Clients → New Client.

Enter a name (whatever helps you recognize them — the customer's company name usually works) and save.
After creating the client, the detail page opens with three things to do:
The M365 connection needs to be in place before you can run a migration, but you can create projects first if you'd rather come back to the admin consent step later.