When migrating tasks to Microsoft Planner using Project Migrator, you might encounter the error: "Could not add comments: unable to create conversation thread." This issue occurs due to insufficient permissions for the account connected to Planner.
Root cause:
The migration account does not have the necessary permissions to add Task Comments in Planner. Specifically, the account must have an Exchange Online license to create conversation threads and add task comments.
How to resolve the issue:
1. Assign the required license: Ensure that the migration account is assigned an Exchange Online license.
Alternatively, use another account that already has the required license assigned.
A full list of requirements for the Planner migration account is available here: Connection Account Requirements.
2. Restart the migration:
Once the correct license has been assigned, you can restart the migration for the incomplete items. For detailed steps, refer to this article: How to Restart Migration for Uncompleted Items.
Key recommendation:
To ensure a smooth migration process, assign the appropriate license to your migration account before starting the migration.