Cant sign into Skype for Business error message. "You cant sign in with this version of skype for bu

Can't sign in with the error message "You can't sign in with this version of Skype for Business. Please install a newer version.

I have the latest version installed. My phone is up to date.

Yes I have uninstalled and reinstalled the app.

Yes I have tried using the advanced options.

This has persisted for over a week with me unable to log in.