External monitor can't play Netflix via browser
Hi - I have just added a Dell UltraSharp 27" monitor to my MacBook Air and found that I can only hear sound, but get no pictures for both Netflix and Prime Video.
I am using the supplied USB C cable (from the monitor) and it works well enough for charging.
Am I missing anything obvious? (have already tried a complete monitor power down and disconnecting from my MacBook but to no avail).