I would just like to point out that I have made some imports, which have been successful, and from the logs it results this:
[2022-07-07 09:12:50] WARNING: E_WARNING: Undefined array key 2 {"code": 2, "message": "Undefined array key 2", "file": "/ var / www / html / application / Espo / Tools / Import / Import.php "," line ": 1073} []
Ver. 7.1.9