Below are steps to create a proxy to run a SQL Agent Job.
Step 1 - Create New Credential
Open SSMS, select Security - Credentials. Right-click and select "New Credential..."
Enter a valid SQL User and password with Windows Authentication.
Step 2 - Create New Proxy
Select SQL Agent Job - Proxies. Right-click and select "New Proxy..."
Select the required desired subsystem, for example a proxy to process SSAS cube.
- Enter the Proxy Name.
- Select the Credential created in prior step.
- Activate the desired command/features in subsystem.
Step 3 - Map Proxy in SQL Server Job
Select SQL Server Agent - Jobs
Open the desired job and add/edit Step
- Enter Step Name
- Select the Job Type, for example SSAS Command
- Map the new Proxy in "Run As:"