Having the same problem. But I’m using a drop down menu on our staff contact page and that no longer works the same. I rebuilt the drop down menu which creates a menu-tag like always, but now that doesn’t send out any emails. To solve the problem I had to add a comma after the menu-tag followed by another tag. So it looks like this:
[menu-123], [your-name] <[your-email]>
That works and the sender gets a copy of the message, but it still has the error message. Without the comma it doesn’t work.