Issue
Unable to save V1 Journey draft with error "The journey could not be saved"
Product
Twilio Segment
Environment
Segment Console
Cause
One possible cause is that the journey version is using a destination that no longer exists in the Engage space. In these cases, the error the client can see in the network tab, for the graphql?operation=SaveDraftEventTriggeredCampaign request, will be Destinations not found: <destinaton_id>.
Resolution
Since the destination used by the journey no longer exists, the solution is to delete the destination step and add one that does exist in the space.