How to fix Index Coverage Issue Detected in Google search console tool

First login to your Webmaster Tools. Then click on Status >> Index coverage >> Submitted URL marked 'noindex'.

Here Google will provide 4 methods (Test Robots.txt Blocking, Fetch as Google, View as Search Result, Submit to Index) to fix your affected URLs.

If you are a WordPress user then you can easily fix Index Coverage Issue with the help of Yoast SEO plugin.

After getting the Affected Page (URL), login to your WordPress site. Then navigate to the Affected page (URL) and click on edit post.

After that go to Yoast SEO settings section and click on GEAR icon and “Allow search engines to show this post in search results?” From the drop-down menu of "Yes" and "Should search engines follow links on this post?" Also select "Yes".

After doing this, update your post and repeat the same process for other affected pages. After changing the meta robots index, submit the sitemap again.

You have successfully fixed the Index Coverage Issue.