The Instant View Editor uses a three-column layout, so you really want to use it on a desktop screen that's wide enough. Sorry for the inconvenience.

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Issue #1

You set wrong description. While there are exist special paragrhaph with "description" class you must use it first.
Here's what checklist says

If a short description exists in the source, it must be used for the link preview (OpenGraph descriptions, lead sections, etc.).
If the description in the meta data (routinely) doesn’t describe the contents of the article, your template must create a description using the subtitle or lead section, first paragraph, etc.
Falko
From the section you quoted: "If the description in the meta data (routinely) doesn’t describe the contents of the article, your template must create a description using the subtitle or lead section, first paragraph, etc."

But the description in the meta tag accurately describes the contents of the article, so it's perfectly fine to use that.
Type of issue
IV page is missing essential content
Reported
Mar 25, 2019