This question already has an answer here:
For the last couple months, I've been unable to fetch any pages of my site in Google Search Console.
(The error message says "Temporarily Unreachable")
Here are the possible causes I've come across and the ways I've tried to test them.
*The page doesn't exist. (I don't think this is it because the page is visible to any non-bot visitor.)
*The Googlebot is being blocked by my robots.txt file. (I don't think this is it because the only entry on this file is User-agent: * )
*The Googlebot is being blocked by my hosting company. (I don't think this is it because I viewed the bot traffic stats and Googlebot is successfully crawling the site.)
*The page takes too long to load and creates a timeout error. (I don't think this is it. Some of my pages are genuinely slow, but--as a test--I also uploaded some small, mostly blank html pages which load in half a second. And, they won't fetch either.)
Although a variation of this question have been asked elsewhere on the site, the suggested answer--that this is a temporary issue in Google Search Console--doesn't apply in this case as the issue has been persistent for eight weeks in my case.
If you can see an error in my testing logic above, please let me know. Alternatively, if you can think of another angle from which I should approach this, I'd be curious. Thanks!