2013 MacBook Air won't recognize external monitor

Hi,

My MacBook Air won't recognize my new LG monitor using a Phillips Mini Display Port to HDMI adapter...no matter how many times I press the 'Detect Displays' button

https://support.apple.com/kb/sp678?locale=en_US

https://www.lg.com/us/monitors/lg-27mn60t-w-led-monitor

https://www.target.com/p/philips-mini-displayport-to-hdmi-adapter-white/-/A-53243109?ref=tgt_adv_XS000000&AFID=google_pla_df&fndsrc=tgtao&DFA=71700000012807845&CPNG=PLA_Electronics%2BShopping_Local&adgroup=SC_Electronics&LID=700000001170770pgs&LNM=PRODUCT_GROUP&network=g&device=c&location=9028817&targetid=pla-636372392629&ds_rl=1246978&ds_rl=1248099&gclid=Cj0KCQiA0fr_BRDaARIsAABw4EtOxlFOQOIz9iFgnypYQkkUjHjOnclUw8RknGeTbYdZFersN9Uk-s8aAraIEALw_wcB&gclsrc=aw.ds

It says right there on Apple's website this should work

"Thunderbolt digital video output:

• HDMI audio and video output using third-party Mini DisplayPort to HDMI Adapter (sold separately)"

The same LG monitor works with my older 2012 Macbook pro using the same adapter, so it shouldn't be a matter of age.

I've also tried a Dell external monitor and it was not recognized by the 2013 MacBook Air...no matter how many times I press the Detect Displays button.

Thanks in advance for your advice.

macOS Big Sur 11.1

MacBook Air (13-inch, Mid 2013) - Technical Specifications

Display

• 13.3-inch (diagonal) LED-backlit glossy widescreen display with support for millions of colors
• Supported resolutions:
• 1440 by 900 (native), 1280 by 800, 1152 by 720, and 1024 by 640 pixels at 16:10 aspect ratio and 1024 by 768 and 800 by 600 pixels at 4:3 aspect ratio

Storage1

• 128GB flash storage

Processor

• 1.3GHz dual-core Intel Core i5 (Turbo Boost up to 2.6GHz) with 3MB shared L3 cache

Memory

• 4GB of 1600MHz LPDDR3 onboard memory

Size and Weight

• Height: 0.11-0.68 inch (0.3-1.7 cm)
• Width: 12.8 inches (32.5 cm)
• Depth: 8.94 inches (22.7 cm)
• Weight: 2.96 pounds (1.35 kg)2

Graphics and Video Support

• Intel HD Graphics 5000
• Dual display and video mirroring: Simultaneously supports full native resolution on the built-in display and up to 2560 by 1600 pixels on an external display, both at millions of colors
• Thunderbolt digital video output
  • Native Mini DisplayPort output
  • DVI output using Mini DisplayPort to DVI Adapter (sold separately)
  • VGA output using Mini DisplayPort to VGA Adapter (sold separately)
  • Dual-link DVI output using Mini DisplayPort to Dual-Link DVI Adapter (sold separately)
  • HDMI audio and video output using third-party Mini DisplayPort to HDMI Adapter (sold separately)