Hello UtauyoNASE,
Thank you for using the Q/A forum.
Kindly be informed that the Microsoft project application is not yet supported for Microsoft Teams Shared Channels.
To get a view of supported applications for Shared Channels, kindly refer to the Microsoft documentation below:
https://learn.microsoft.com/en-us/microsoftteams/shared-channels#supported-apps-in-shared-channels
Let me know if this answer your questions or you require more assistance.
Thank you.