Hi @Jose IT Junior ,
Welcome to the Microsoft Q&A platform!
To migrate mailboxes across tenants in Microsoft 365, you will need the Cross Tenant User Data Migration add-on. This add-on is available for various Microsoft 365 subscription plans, including:
- Microsoft 365 Business Basic, Standard, and Premium
- Microsoft 365 F1/F3/E3/E5
- Office 365 F3/E1/E3/E5
- Exchange Online
- SharePoint Online
- OneDrive for Business
This add-on is required for cross-tenant migrations and is available as a separate purchase.
Please feel free to contact me for any updates. And if this helps, don't forget to mark it as an answer.
Best,
Jake Zhang