View product count not updating

These tables would not update on runtime

You need to run Refresh Statistics from:

Reports -> Statistics -> Refresh Statistics

If you want to run it from cronjob follow this link: https://magento.stackexchange.com/a/243187/31910

Go to Admin -> Reports -> Refresh Statistics, then select the reports you want to refresh, then hit the submit button.

Once refresh, go back to the report, and select the required to and from dates, then click on the show reports button.

You should see the report as required.

If there is still nothing, the you may need to dig around in the report_viewed_product_* tables and see if there is in fact any data there.

After the answer @Shoaib Munir & @Rk Rathod, These tables would not update on runtime so you need to run Refresh Statistics from Reports -> Statistics -> Refresh Statistics every times. but if you don't want to refresh Statistics manually every time so you may set cron for that so it will refresh Statistics automatically.

First, you need to pass reportTypes argument to your cron class by using di.xml like below (I have passed all the arguments you may pass as per your requirement).

<type name="Vendor\Module\Cron\CronFile">
        <arguments>
            <argument name="reportTypes" xsi:type="array">
                <item name="sales" xsi:type="string">Magento\Sales\Model\ResourceModel\Report\Order</item>
                <item name="tax" xsi:type="string">Magento\Tax\Model\ResourceModel\Report\Tax</item>
                <item name="shipping" xsi:type="string">Magento\Sales\Model\ResourceModel\Report\Shipping</item>
                <item name="invoiced" xsi:type="string">Magento\Sales\Model\ResourceModel\Report\Invoiced</item>
                <item name="refunded" xsi:type="string">Magento\Sales\Model\ResourceModel\Report\Refunded</item>
                <item name="coupons" xsi:type="string">Magento\SalesRule\Model\ResourceModel\Report\Rule</item>
                <item name="bestsellers" xsi:type="string">Magento\Sales\Model\ResourceModel\Report\Bestsellers</item>
                <item name="viewed" xsi:type="string">Magento\Reports\Model\ResourceModel\Report\Product\Viewed</item>
            </argument>
        </arguments>
    </type>

Then in your cron file should be like this.

<?php
namespace Vendor\Module\Cron;
use Magento\Reports\Model\ResourceModel\Refresh\Collection;

class CronFile extends Collection
{
    protected $logger;
    protected $reportTypes;

    public function __construct(
        \Magento\Framework\Data\Collection\EntityFactory $entityFactory,
        \Magento\Framework\Stdlib\DateTime\TimezoneInterface $localeDate,
        \Magento\Reports\Model\FlagFactory $reportsFlagFactory,
        \Psr\Log\LoggerInterface $logger,
        array $reportTypes
    ) {
        $this->logger = $logger;
        $this->reportTypes = $reportTypes;
        parent::__construct($entityFactory,$localeDate,$reportsFlagFactory);
    }
    /**
     * @return $this
     */
    public function execute()
    {
        $objectManager = \Magento\Framework\App\ObjectManager::getInstance();

        try {
            $codes = $this->loadData();

            foreach ($codes->_items as $codek=>$codev) {
                $objectManager->create($this->reportTypes[$codek])->aggregate();
            }
        } catch (\Magento\Framework\Exception\LocalizedException $e) {
            $this->logger->critical($e->getMessage());
        } catch (\Exception $e) {
           $this->logger->critical($e->getMessage());
        }
        return $this;
    }
}

I hope it helps!