Why am I receiving Error Code 4 when I sign in to Zoom?

If you receive the message "Failed to sign in. Please try again. (Error Code: 4)" then there is an issue with your Zoom application's local data. 

How to fix Error Code 4

The simplest way to resolve this issue is to uninstall the Zoom application, then download and reinstall it. 

Alternatively, on a Windows device you can open File Explorer and locate the file named %appdata%/Zoom/data then delete it.

On a MacOS device open Finder and locate the file named ~/Library/Application\ Support/zoom.us/data then delete it.