The help page: https://support.google.com/webmasters/answer/11396518 says...
This error can be caused by any of the following conditions: See Fixing HTTPS not evaluated errors.
The HTTP URL has no equivalent HTTPS URL. If the equivalent HTTPS URL doesn't exist (404 error) or Google encounters any other 4XX error (such as auth required) or 5XX level error (server issues), then the URL will be labeled as HTTPS not evaluated.
The HTTP and equivalent HTTPS URLs exist, but for some reason Google chose the HTTP version as canonical. Be sure to mark your HTTPS as canonical using one of these methods.
Google encountered so many errors of any type that it has stopped processing queued URLs on your site. Any remaining queued URLs are labeled as HTTPS not evaluated.
There is a site-wide error that prevents Google from evaluating this URL (for example, a bad SSL certificate for the site).
Google has never seen the URL, or has seen the URL but not crawled it yet.
So in general this is a catch all message, and it's quite possible there is nothing specifically wrong with the URL in question, particularly if reported on a https URL. Some of those possibilities may not be applicable to your particular case.
Explore the new HTTPS report in more detail, and see if getting other messages reported. As noted on the above help page, concentrate on those other issues as applicable. Access the report at: https://search.google.com/search-console/https
Errors reported across the Internet.
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It's a new "catch all" message. See https://support.google.com/webmasters/thread/179396969