We use the http://xip.io/ in WordPress Multi-Site in order to provide a valid DNS. However, if you are using a Lightsail LoadBalancer you could configure the DNS that the service provides (or raxplay.com if you already configured it).
You need to remove the redirection to the .xip.io domain from the configuration (/opt/bitnami/wordpress/conf/httpd-prefix.conf) and configure the application to use the LoadBalancer domain. This guide will help you to do so.
Then, make sure the LoadBalancer is redirecting the traffic to your WordPress instances and the health check protocol point to HTTP (and / path if you configured WordPress to run under raxplay.com/ directly).
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