If you signed up to hayu in an EU country where hayu is available (United Kingdom, Ireland, Denmark, Sweden, Finland), you can watch your home hayu service (ie the shows available in your country) in any other EU country. This will mean that you will have access to all of the same shows you watch at home when you're watching in another EU country.
If you signed up to hayu in Australia, Canada or Norway, you can access the local hayu service (ie the shows available in whichever country you're currently watching from) in any of the countries where hayu is available. This may mean that certain shows are not available when you are travelling. This is due to rights restrictions.