I got this reply below, but I cannot create a support ticket without having to log into ESP.
Thank you for contacting us. If you are experiencing sign-in issues, we will do our best to respond within 2 business days.
If you are contacting us regarding your iStock account, please sign in to your ESP account to review our FAQs. If you cannot find the answers to your inquiry, please open a support ticket.
The Content Support Team