Private Site Collections Vanity URLs - SP Admin Center
It would be great to have the ability to create host named site collections for private sites. In the first example, there is a completely new vanity URL. The second example is if the first is not possible. Changing the domain prefix if you change company names for whatever reason. Ours has random letters attached to the end of the company name. The only way to change this currently is to create a new O365 subscription with the new domain and migrate everything over manually.
Examples: <companyname1>.sharepoint.com change to intranet.<companyname1>.com
or at least, <companyname1>.sharepoint.com change to <companyname2>.sharepoint.com
Esteban V commented
what does this have to do with Office Video?? I think this is for sharepoint user voice not for office video