Office 365 tenant is a dedicated instance of Microsoft’s cloud productivity and is known as Microsoft 365. Moreover, the manual process of migration of domain from one O365 tenant to another is both complex and time-consuming. Additionally, there is a
limitation of the procedure during the merger process there is a big risk of data loss. This will make it more difficult when the data is not migrated properly from one tenant to another. Furthermore, experts recommend a specialized tool SysTools Office
365 Merge Tool ( https://www.systoolsgroup.com/office-365/merger/ ) can merge the two Office 365 tenants very easily. This tool allows you to start by connecting the source and target Office 365 tenants.

For more information read below resources:

1. https://www.systoolsgroup.com/office365-express-migrator.html
2. https://www.systoolsgroup.com/gsuite/migrator/
3. https://www.systoolsgroup.com/office-365/gsuite/
4. https://www.systoolsgroup.com/teams/migrator/
5. https://www.systoolsgroup.com/sharepoint-migrator.html
6. https://www.systoolsgroup.com/onedrive/migration/
7. https://www.systoolsgroup.com/onedrive/google-drive/

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