Insureds have the ability to send self-serve certificates. Not just for their accounts, but for linked insureds as well.
Here is what the agency needs to do:
1. Link the two insureds
2. Edit the permissions in the user profile of each insured to allow to "See linked insureds"
3. When the insured logs in, they will see an option called "Linked Insured". If they need to send a certificate for that insured, they will click on that insured and then they will be able to see the option to send certificates.