In the setting we are able to choose the login method username of email address, but the translation does not distinguish between those.

That means users get confused and try to login using a username, though only email address has been set.

 

It would be nice if you could change that.

 

 

Please ensure that all your login methods are set to email address. What you are stating here would indicate that you haven't done this and one is set to display name still. 

You are soooo right…😏

Thanks!

Glad you got it sorted 🙂