External Display recognized as DisplayPort, but connected via adapter using HDMI

I'm trying to connect a brand new macbook Pro with 2 USB-C using an adapter with HDMI. The macbook detects the display, but the Connection Type is DisplayPort. Is there a way to change it? Screen displays the message "No HDMI signal detected"

Chipset Model:	Intel Iris Plus Graphics 640
  Type:	GPU
  Bus:	Built-In
  VRAM (Dynamic, Max):	1536 MB
  Vendor:	Intel
  Device ID:	0x5926
  Revision ID:	0x0006
  Metal:	Supported, feature set macOS GPUFamily2 v1
  Displays:
Colour LCD:
  Display Type:	Built-In Retina LCD
  Resolution:	2560x1600 Retina
  Framebuffer Depth:	24-Bit Colour (ARGB8888)
  Main Display:	Yes
  Mirror:	Off
  Online:	Yes
  Rotation:	Supported
  Automatically Adjust Brightness:	No
DELL U2917W:
  Resolution:	2560x1080 (UW-UXGA - Ultra Wide - Ultra Extended Graphics Array)
  UI Looks like:	2560 x 1080 @ 60 Hz
  Framebuffer Depth:	30-Bit Colour (ARGB2101010)
  Display Serial Number:	749DX73N346L
  Mirror:	Off
  Online:	Yes
  Rotation:	Supported
  Automatically Adjust Brightness:	No
  Connection Type:	DisplayPort  # I believe this is the problem.