Massagebook is only available in the US and Canada. In the interest of security, IP addresses in other countries are blocked. If it is imperative that you have access to your account while traveling abroad, we recommend you use a US-based VPN service.
VPN services allow you to choose the country through which to route your internet traffic. You can select the USA or CAN as the country through which to route your traffic and Massagebook will "see" your location as being inside the US (even though you are not). You will then be able to access your account.
Below are several well-regarded VPN services:
1. NordVPN: https://nordvpn.com/
2. SurfShark: https://surfshark.com/vpn
3. Private Internet Access: https://www.privateinternetaccess.com/
4. CyberGhost: https://www.cyberghostvpn.com/en_US/
5. Tunnelbear: https://www.tunnelbear.com/
6. ExpressVPN: https://www.expressvpn.com/
7. MozillaVPN: https://www.mozilla.org/en-US/products/vpn/