Apps4.Pro Migration Manager uses Microsoft Graph API to perform the Planner migration.

1. Requests are made to connect source and target tenant
2. Create user mapping between the source and target tenant
3. Get Planner plan details to migrate
4. Create the Microsoft365 Group, if required in the target tenant
5. Create the Planner plan with the same meta-data as in the source
6. Get the task details along with meta-data from the source tenant.
7. Create tasks in the newly created plan
8. Create the task conversation in the new task
9. Add as Teams team channel tab, if required
10. Do steps 4 to 9 for all the Planner plans to migrate

The entire process takes place over HTTPS connection. The data is cached in the installed machine for the migration.