Starting with the release of Strategy ONE (March 2024), dossiers are also known as dashboards.
After sending a dossier into the History List and deleting the dossier, you may encounter the following error when trying to use the History List message to save a copy of the dossier.
The Object does not exist in Metadata

However, the dossier can still be saved.

This is a known issue and is being investigated by the Technology team.