Import to target failed due to an update conflict as more than one process is trying to update the same record at the same time. Please try again in D365 FO

You may face this error when importing data through data entities and this mostly because of the index of the staging table.

The data in your file doesn't match with the index which causes violation and let system through this error.

Even this could happen when the index is not properly synchronized in the table that is used in the data entity. If so, try recreating the index.