Anyone having this issue?
data migration > EAV Step
SQLSTATE: Integrity constraint violation: 1062 Duplicate entry '9-product-details' for key 'EAV_ATTRIBUTE_GROUP_ATTRIBUTE_SET_ID_ATTRIBUTE_GROUP_CODE'
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First check this link :- https://github.com/magento/data-migration-tool/issues/235#issuecomment-321923437
Solution is to rename all values containing the name "Default" in "attribute_value_name" field of eav_attribute_set table to "Default_x" in the Magento 1 database and run the migration from scratch.
In my case, there were 9 records with name "Default". So I renamed them to Default_1 to Default_9 and it worked perfectly!
check this :- https://magento.stackexchange.com/a/158788/85907
Hope this help you