Removed AMP? Don't Worry About Redirecting AMP Cache URL, Says Google.
The AMP cache URL is the URL that looks like https://www.google.com/amp/s/ followed by your site’s details. You do not have fully control over that URL, so there is really no need to worry about having that URL redirect to your site. Google’s John Mueller said on Reddit “It’ll fix itself automatically, you don’t need to do anything special with it & you can’t redirect it.”