Hello Esiemoen
Yes according to the specification here:
Second Screen and Sync Screens modes: Simultaneously support full native resolution on the integrated display and up to 2560 x 1600 pixels resolution on up to two external displays, both with several million colours.
You probably just can't use the maximum resolution of the monitor.
Got it from here:
https://support.apple.com/kb...
This should be your model...
Greetings
CysteK
