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Hi @Guido Widyawan ,
This appears to be a stale Playbook Generator session, rather than a browser issue. Closing the tabs or using an InPrivate window may not release the active session immediately.
Please open the existing Playbook Generator entry shown in the Playbooks list and, if the editor opens, use Save and exit to close the session correctly. Then refresh the Defender portal and try creating the playbook again. Microsoft’s guidance recommends using Save and exit when leaving the generator and closing the editor after saving.
If the existing session cannot be opened or the message continues after waiting, the session may be locked on the service side. In that case, a Microsoft support case should be opened so the stale session can be investigated or cleared. Include the tenant ID, subscription ID, workspace name, affected user account, and the approximate time the session was first opened.