Why am I getting an error when running 'shopify populate products' command?

Hey
If I’m running “shopify populate products”, I always get the error:

✗ Command not allowed with current login. Please check your login details with shopify whoami. You may need to request additional permissions for this action.

I’m the shop owner and I already read that as a shop owner you do not have the permissions. So I created a second partner account and add it as a staff member with all permissions, but I still get this error, even if I use the second partner account.