Minecraft Education Edition: URL's to whitelist
Below is a list of URL's that are required to get Minecraft working for your class:
meeservices.azurewebsites.net
trg-minecraft.userpxt.io
uhf.microsoft.com
tynker.com
education.minecraft.net
minecraft.makecode.com
%20trg-minecraft.userpxt.io
minecrafteduservices.com
secure.aadcdn.microsoftonline_p.com
dc.services.visualstudios.com
makecode.com
.xboxlive.com
studio.code.orgstudio.code.org
minecraftprod.rtep.msgamestudios.com
pxt.azureedge.net
Be sure to whtielist these as a whole domain so that all the services can pass through for Minecraft to work.