When migrating managed metadata, it is strongly recommended to have 'Term Store Administrator' permissions on your source/destination site

Symptoms

When attempting to migrate term sets or term groups, one of the following messages is displayed: 

When migrating managed metadata, it is strongly recommended to have 'Term Store Administrator' permissions on your source site.
When migrating managed metadata, it is strongly recommended to have 'Term Store Administrator' permissions on your destination site.

Error code

• AN-021-002

Details

We highly recommend that the user used for a managed metadata migration possess the term store administrator rights on the source and the destination. Those permissions are required to read all the required information from the source and to update the destination environment accordingly.

Solution

Grant Term Store Administrator permissions to the user performing the migration both at the source and at the destination.