This message was posted by a user wishing to remain anonymous
Hello,
What I typically do is contact customer service and let them know that I am collecting due diligence documentation. in your case I would let them know upfront that you are needing X type of insurance certificate and that your organization is a current customer, provide your organization's name. I have found that their customer support teams will usually take care of my requests fairly quickly, or they get me in contact with the right person.
Hope this helps!