My hdmi cable is not working.

Hello Tcabe44,

Thank you for reaching out to Apple Support Communities.

This may be able to help:

"Connect iPhone to a display with a cable

With the appropriate cable or adapter, you can connect your iPhone to a secondary display, like a computer monitor, TV, or projector.

1. Plug a Lightning Digital AV Adapter or Lightning to VGA Adapter into the charging port on the bottom of iPhone.
2. Connect an HDMI or VGA cable to the adapter.
3. Connect the other end of the HDMI or VGA cable to the monitor, TV, or projector.
4. If necessary, switch to the correct video source on the monitor, TV, or projector. If you need help, use the display’s manual.

The adapters have an extra port so you can connect the charging cable and charge your iPhone while connected to a monitor, TV, or projector."

This article can provide more details: Connect iPhone to a display with a cable

If the issue persists, can you provide a few more details? Which iOS version are you currently using? Have you tested with another display? What kind of display are you currently using? Also, has it ever worked previously?

Cheers!

Are you kidding?!?!? Do you at Apple not realize this happens on the regular? I freaking went to the Apple Store the last time this happened and spent $56+ tax on a new adapter, only to find that didn't work either! Suddenly it was working again last week, but now it's not. GET YOUR **** TOGETHER. We pay you a loooooooot of money. SO ready to find another provider.