Viewport not configured but I have this code:
<meta name="viewport" content="width=device-width, initial-scale=1.0">
I test https://www.google.com/webmasters/tools/mobile-friendly/ and it says, "Awesome!
The tool says it is mobile-friendly, but meanwhile in Google Mobile Usability the error is still there.
I fixed the issue in May 2015 Latest Status: 6/14/15
For webmaster tools, the tag should end with
/>
and be the first one in the header: