Hi Richard,
I just successfully run all commands with sample CSV file after I deleted the “Manager” column. So please directly delete the column or don’t input any characters, then run the command again.
You also can create a test contact via ECP, when we choose Manager for the test contact, we only can select users or contacts from the Global Address List , can’t directly input. I think this is why we can’t input any characters in “Manager” column when we import contacts via powershell.
Thanks,
Jacky Ding