Since receiving update from Oneplus on an Oneplus Nord this morning (10.5.7.AC01BA) the app won’t display the controls in the notifications area; notifications are “on” both in android settings and sonos app.
Found people with same problem on different Oneplus devices here => https://forums.oneplus.com/threads/issues-with-new-sonos-s2-app-on-7t-pro.1237688/