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I don't believe margin requirements for futures are available anywhere in Eikon. However I'm not a data specialist. You may want to verify this with Refinitiv Helpdesk by either calling the Helpdesk number in your country or by using Contact Us capability in your Eikon application.
If the Helpdesk tells you that initial and maintenance margins for futures are indeed available, could you please share on this thread how to view them in Eikon.
Thanks.