If a recruiter encounters a 403 error, it is because they are trying to log into several of their recruiter accounts simultaneously, across several Career Centers.
You must ask them to log out from the other Career Center accounts they are logged into, before trying to connect to your Career Center.
To save time, they can also delete cookies from their browser. To help with this process, you can send them the link below which explains how to do this:
We have created an article in the Help Center for recruiters that is ready to share with your contact: Click here