After you clicked Validate Fix, there will be a message to inform you that Google Search Console will start to validate all the previous errors. And this can take up some time to complete, depending on the number of urls to validate.
When Google has validated, and all issues are resolved, you will receive a very nice email from Google Search Console to inform you that all has been fixed and validated. See image below.
Notice I had 143 pages with the Submitted URL marked NoIndex issue. And the email has informed me that all 143 pages were validated as fixed. Also, Index Coverage Issues were successfully Fixed.
Oh BUT WAIT!!!
What about specific Pages and Posts, for example Privacy Policy page, that may cause this error too?
Go to the next page for info on how to resolve for specific Pages and Posts.
Great training.
May I add that this will however not fix the issues with people that have the warning for pages or posts like for example the privacy policy because these are marked as noindex.
To fix this people have to indicate on the page or posts themselves that they do not want to include it in the sitemap - it can easily be done in All in One just below them meta description.
All the best,
Mikael