Unable to add an item to a bulk redirect list via the API

Hello, I’m trying to add an item to a bulk redirect list via the API, however I always get this result :

“success”: false,
“errors”: [
{
“code”: 10000,
“message”: “Authentication error”
}

I have of course created a token with what I think are the good permissions (Bulk Redirect List EDIT and READ), I have tried logging out and back in.

My token is valid and active. What am I missing?

Many thanks,

Jean-Louis