403 Error when trying to unlock asset

This what I get:

“type”: “ForbiddenError”,
“status”: 403,
“message”: “You don’t have permission to lock or unlock assets for this user”

I’m able to list my assets so I know I’m properly connected to the API.

I’m using the following Raw JSON
{
“data”: {
“userId” : “637573e1b7ce9c00083ceXXX”
}
}

what am I missing here??

Thank you!