Enterprise Release Management is only available on Enterprise Plans.
About ERM
ERM enables different use cases, the common use cases being:
Software development risk mitigation
ERM enables organizations that desire separate environments/project spaces for application development, testing, training, and production usage of digital solutions. The separation of environments is often desirable for complex applications that are updated often and require rigorous testing.
Rapid deployment of centrally built apps to multiple local teams
Centralize your app building to a dedicated team of experts, who can then push read-only versions of such apps for multiple teams with the click of a button!
Setting up ERM
In order to link Project Spaces with ERM, the user needs the Enterprise Release Management permission added to their role.