I need confirm if i need a specific license to use Across tenant

Hi @Jose IT Junior ,

Thanks for your response!

Let me answer your questions one by one:

1. It is usually not possible to transfer Microsoft 365 licenses directly from one tenant to another. You usually need to purchase new licenses for the target tenant. However, in some cases, especially for enterprise agreements, licenses can be reassigned to new tenants using a process called "remapping".
2. You cannot use the same domain in multiple Microsoft 365 tenants. Each domain can only be associated with one tenant at a time. If you need to use the same domain in different tenants, you can consider using subdomains or different domain names.
3. The migration process can be configured to migrate emails from a specific time period. For example, when using IMAP migration, you can migrate items in user inboxes or other mail folders, but emails are usually migrated from the newest to the oldest. You can also set up a phased migration to move emails over a predetermined period of time.

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