Hello @charles yu ,
Welcome to Microsoft Q&A!
I need to apply for a feature ID and use token, but I don't know where to submit the request?
It is recommended to open a free support ticket here. You will get 1:1 support on that. Select Developer Tools -> Compliance Documentation (internal only) -> Windows LAF API -> LAF API Inquiry -> Access request in the support page and you could contact the team.
Thank you.