All connected sites are going into failed state under change management after staging is initiated on the MCN :

Also not able to download the staged package for any site using the Staged link in change management, as highlighted above.

The issue can happen when one of the required files to create the packages for the sites are missing. To fix this, upload the .zip file for the firmware running in the environment, under Change Preparation in Change management and once the file is uploaded and processed, the missing files would be recovered :

Please note that simply uploading the file would fix the issue. It is not required to perform the staging again using the firmware file. So once upload is complete and file is processed, you can clear the file.

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Problem Cause

The issue happens because of missing files required to create the package.