Planets uses our Makers Empire domain to connect to the servers, however with the Planets update, came a new URL link used by the feature.
This means that there is now an additional URL that your Schools IT Department will need to allow access to, in order for Planets to work.
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The new link is: fn1.makersempire.com

You can also find all the required firewall links in this help article.
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Please make sure all links are whitelisted by your IT department.