Thank you for posting your question in the Microsoft Q&A forum.
Based on the information you have provided, looks like you want to share edit access of Copilot agent to another user.
This feature is called collaborative authoring.
You can only share an agent with users who have a Microsoft Copilot Studio per user license.
You can read more at Share agents with other users - Microsoft Copilot Studio | Microsoft Learn
I hope this information helps.
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