A nomination is the Confirmation/validation of your application from your home institution. In order to be admitted you should have been officially nominated by your home university.
During the application period:
For Autumn arrivals: from 1st to 30th April
For Spring arrivals: from 1st to 31st October
Partner institution have to log in the Online services and proceed to nomination.
Check your status in the application any time and verify with your international office if you have been nominated.