No publication date found Linkedin POST INSPECTOR

It took me more than a month to find the cause of not finding the publication date.

Here my code:

<meta charset="utf-8">
<title>Rouse - Rouse launches China Software Litigation Report</title>

<meta name="robots" content="index, follow">
        <meta name="title" content="Rouse launches China Software Litigation Report">
    <meta property='og:title' content='Rouse launches China Software Litigation Report'/>
    <meta property='og:image' content='https://sitedev.rouse.com/media/hqphzwt4/data-abstract.jpg?anchor=center&amp;mode=crop&amp;width=1903&amp;height=713&amp;rnd=132415927615200000'/>
        <meta property="og:type" content="article">
        <meta property='og:description' content='Report examines how foreign companies have fared in Chinese courts'/>
        <meta property='og:url' content='/insights/news/2020/rouse-launches-china-software-litigation-report'/>
        <meta name="article-published_time" property="article:published_time" content="2019-10-21T00:00:00-0600">
        <meta name="article-modified_time" property="article:modified_time" content="2019-10-22T13:47:16-0600">
        <meta name="publish_date" property="og:publish_date" content="2019-10-21T00:00:00-0600">  
        <meta name="author" content="Chris Bailey, Doug Clark, Nandi (Landy) Jiang"/>
        <meta name="generator" content="Chris Bailey, Doug Clark, Nandi (Landy) Jiang" />

I have referenced at this link Creating meta tags for Linkedin - Publish Date "not found" but it not working.

And I asked the facilitator but the answer was up on the stackoverflow to ask the geeks

Where did I go wrong?