Target Display Mode not working

I clear all the requirements to use Target Display Mode but all I get is "black screen". Are there any settings needed?

I followed every requirements in this link. It's supposed to work but all I get is black screen in the iMac.

Checked the software and hardware versions and specified cables. The iMac screen turns black when I press Command + F2. I also checked if my F keys are set to use as standard function keys. They are unchecked.

Not sure if there are other settings needed to make this work?

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