Need to confirm that ExpressVPN work with MyTVOnline or not. No doubt expressvpn is top notch vpn for unblocking live and streaming channels but some channels might don't work with it. I tried NordVPN that works well with most of tv channels.
You can check out the list of channels that expressvpn and nordvpn unblock. A detailed comparision of Nordvpn vs ExpressVPN can help you more here.
Till then wait for Express support team to guide you for this.