The License and Roles required to perform Groups Migration are as below :

1. Microsoft 365/Office 365(E3 or E5) License is required for Source & Target Connector Accounts.
2. Microsoft Planner License is required for both Source & Target Connector accounts.
3. Exchange Online License is required for Target Connector account.
4. Groups Administrator role is required for both Source & Target Connector accounts.
5. Source Connector Account should be an Owner & Member of the "Groups" that you chose to migrate. (Please refer:- How to Add ‘Source Connector Account’ as a member of the Groups through Apps4.Pro Migration Manager Tool)