[Solved] iMac 2017 5k host, iMac 2017 21 target display mode

blackace Asks: iMac 2017 5k host, iMac 2017 21 target display mode
I am using my iMac 2017 5k as my main machine and want to use my 21 inch 2017 iMac in target display mode.

When I try Command + F2 I hear a beep and nothing happens. I have also tried doing it at the login screen and also tried fn + Command + F2 but nothing worked. What am I doing wrong? Is this possible?

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