Hi @ Matias Semelman •
Thank you for sharing your issue on Microsoft Q&A.
I understand that when you're trying to add the GH - Copilot application, you encounter a Type Error with the message: "Cannot read properties of undefined (reading 'approver')." This error usually indicates that the application is attempting to access a property for which you don't have the necessary permissions. Some applications may require administrator approval before they can be added, and in such cases, The app won't appear on the Apps page until it has been added and approved by the administrator.
For additional information please refer this link: Sign in and start apps from the My Apps portal - Microsoft Support
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Harshitha Eligeti