If you receive the message Spotify desktop client communication failed when trying to Login with Facebook to the Spotify app here’s why and how to fix it.

Reason

It was because I have 2 factor security turned on.

Resolution

1. Go to https://www.facebook.com/settings?tab=security&view
2. On the line App Passwords click Edit
3. Click the Generate App Passwords link
4. Click the Generate App Passwords button
5. Enter a friendly name for what this is for i.e. Spotify
6. Click Generate Password
7. Copy the password in the normal spotify logon password box.
8. enter your FB email address as the username.
9. HEY PRESTO!