Ok, I added it, retried my command line. After a while, got another error message :
Cannot find parent with guid '8465215a-1cec-47f6-9965-b1a8fe7b0b00' ['Unable to get object properties: Object with guid '8465215a-1cec-47f6-9965-b1a8fe7b0b00' not found
'].
Trying to follow this KB ...