Mobile Workforce not working - remote server returned an error 404 Not Found.

According to support, the current release build I am on has a bug on the mobile workforce application.
ALL my users are receiving the error "The remote server returned an error: (404) not found and unable to login through the app.

Reverting back to a more stable version does not seem to be an option as it is auto-upgraded.

I have checked on the admin console back end and under extensions, the mobile workforce is listed under INACTIVE and I can't find anywhere to download a copy of the mobile workforce application.

Is there a fix for this and when will it be?

Version - 21.5.2870.7759