It happens when stack is set to private, and owned by you. You should change the ownership of the stack to organization.
Steps to change ownership of the stack:
i. To see used stack (Project-> Stack-> Info) inside IDE.
ii. Go to the Stacks->My Stacks (see left side of the dashboard).
iii. Click on the Stack->Edit (used stack).
iv. Change the Owner from My account to your organizations (name of your organization) then Save. You don't need to publish it again. See screenshot.

Note: You can only edit the stack if it is owned by you.

Your organization can use this stack by changing the ownership from my account to organization.

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