There are two situations that I have run across where a G Suite for Education School would need to whitelist a domain (or subdomain). These are: If your students and teachers are on two different domains If you are in a situation like me - as a support organization I want to provide training to teachers that are in their own Google Apps district It is quite easy to do this - it just has to be done by a Google Apps for Education Administrator. There are THREE parts to this, make sure all of them are set for it to work properly! Part 1 - add the domains In the Google Admin Dashboard, click on Domain (if it doesn't show, click on the More at the bottom) Once in the Domain management area, click on Whitelisted domains- Click on Add new - 1. Type in the domain to whitelist, then 2. Click on Add Domain to Whitelist - Part II - Set Classsroom Settings Go back to the Home level of the Google Admin panel - click on the Apps icon: Click on the...