It is not included in the Office365 license. You can use CoPilot Studio with a trial account to build a bot, but you will need a tenant license to deploy a bot into production in your environment. Bots are billed based on a message allotment per month. This is not the same as Microsoft 365 CoPilot. Take a look at the Copilot Studio licensing on this page. Microsoft Copilot Studio | Customize or Create Copilots
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