I had no problem with display port from Belkin thunderbolt 3 dock and VGA adapter from Apple with my 15" MBP 2017.
will be getting the HDMI adapter from Apple next month, can test for you, although I believe its either your adapter has malfunctioned or....
2017 MBP, Problem connecting to external monitor, Problem connecting to external monitor
Mar 29 2018, 11:25 PM
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