If you are running your application locally, you will have to configure the "best-insurance.com" and "nice-printing.com" domains in your machine. For example, in a Windows machine, it can be done by editing the hosts file.

Then your database Tenants table should have those domains with your application port number. For example, if your app uses port 7000, the Domain column value of your Tenants table should be "best-insurance.com:7000" and "nice-printing.com:7000".