You don’t need a full license of Microsoft 365 Copilot for each user to create custom Bizchat agents, you can tie your Copilot billing to an Azure subscription, create and publish custom Bizchats agents to your users with Microsoft Copilot Studio quick and easily as shown in this video.
Video link = https://www.youtube.com/watch?v=kow8UJmZLaU
CIAOPS 
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