The following article will show you how to set up your white label app so that instead of accessing your app using the myDevices provided domain (e.g. yourcompany.mydevices.com), your customers will use a subdomain you manage (e.g. iot.yourcompany.com).
In order to set up your App for use with a Custom Domain you must use a sub-domain (e.g. iot.yourcompany.com) and you must use either a CDN or Reverse Proxy which is capable of handling the encryption required.
We have created a handy 3 step Guide that will walk you through the configuration and troubleshooting needed to perform this. Also included is an example of using GoDaddy and Cloudflare to accomplish this for a sample domain.