The Tizen Studio Documenation on this is a bit more clearer
- When you need to register devices that are more than 10, upload a txt file using Import a DUID list file menu. One DUID on a line and max 50 DUIDs are available.
So it is a simple text file that can be up to 50 DUIDs minus the ones that were registered in the Samsung Studio.
This is only meant for on device testing. Since you are using a Hospitality TV I assume this is used in a business? Is it a single business or an app that you will distribute?
This is not my area at all, but my guess is for a single business you want the Tizen Business Manager And if it is an app for others then it is distributed in the Smart TV Seller Office and you can sign in and open a Smart TV Seller Support Request.
There is also a Business to Business Portal that may be what you want.
They can help you better there.
Hope this helps,
Ron
Samsung Developer Relations