Can't figure out servername for request

When i try to get guild reports i can’t figure out the right server name.
Tried EU-Megaserver, Megaserver (EU) but none of them work.
What is the server name of the EU server? A little example of a server name in the api docs would be helpful.

The region is EU and the server is Megaserver.

Ah works now ^^
Thank you very much!