http://www.techradar.com/news/the-oneplus-5t-cant-stream-hd-netflix-but-a-fix-is-in-the-works

Last week, disgruntled OnePlus 5T owners took to the firm's forums to complain that their new handset isn't able to stream HD video from popular apps such as Netflix, Amazon Prime Video and Google Play Movies.

In the initial post, user whatthefunk notes: "It's come to my attention (as my 5T is being shipped) that the 5T, as well as other OnePlus devices, do not have the Widevine L1 Certification required to be able to watch HD content from DRM protected services such as Netflix, Amazon Prime, and Google Play Movies."