IF you work with Microsoft Azure, you already know Azure Automation Account and the Automation Account uses certificate to be able to ‘runas’ and execute the actions you defined.
Well, you can now use Managed Identities (either User Assigned or System Assigned).
In the case of User Assigned Managed Identity, you can only use it to execute cloud only jobs while the System Assigned Managed Identity can be used to execute both cloud and hybrid jobs.
Managed Identity is now the default option when creating new Automation Account, you just have to select User, System (default) or both
For existing Automation Account, you can convert from RunAs account to Managed Identity by accessing the Identity blade
You will have to update your RunBooks to ensure they are now using the Managed Identity you have defined.