When a manager assigns training to an employee, or an employee requests training via their self service, the training outcome section will only appear if the training date is in the past. If you add training for a future date, the training outcome section will not be available until the date of the training has passed.

When the training is in the future, the training outcome not available:

When the training is in the past, the training outcome available:

The training outcome result can then be updated https://naturalhr.zendesk.com/hc/en-us/articles/360005433778-Training-result-options-