There are a few answers on here, as well as half solutions
For most people installing the 4.7.1 Dev Pack from Windows seems to work
Unfortunately this did not solve my problem.
I had VS Code set as my external tool
The dev pack was installed
I had the VS Code package installed on Unity
Nothing seemed to be solving the issue
After asking some questions on the Gamedev.tv discord, I was able to find the answer.
Even after all these steps, you may need to press the button, Regenerate project files under Edit → Preferences->External Tools.
One of the individuals who helped me said all the checkboxes need to be checked. It is not clear whether this is true, but I have them checked anyway. Simply pressing the button may solve the issue
