just found out something weird. My note 10 plus doesn't seem to support HDR and has widevine L3 certification and not L1. Also list of HDR supported devices on netflix shows note 10 and not note 10 plus. While galaxy s10 and s10 plus both are listed as hdr capable. Sharing screenshots from Netflix app.
i do know that and i have the plan. but see the screenshots. these are app settings and not the plan settings. these would show the inbuilt capability of the DRM certification. anyways. i figured it out. seems an issue with the netflix app itself. uninstalled and updated it. now its fine