Hi. Your entitlements usually are in your offer of employment. They should be in writing if there becomes an issue later where they have not supplied the entitlements, then you can take action. In this sense, yes they do have an obligation to let you know because how would you be aware of them? Your letter of employment should outline these entitlements and responsibilities. If you have misplaced your letter of employment then I would ask them for a copy for your records. I hope this helps.
Hi, generally, under the NES, your employer needs to provide you with a Fair Work Information Statement, which includes some information about your entitlement, like your right to request flexible working arrangement. But the information in this statement is not detailed. Your entitlements come from the Legislation and legislative instrument, like modern awards or enterprise agreement, as well as your employment contract. Your contract could be better, but could not be worse than the NES and MA or EA.