How can you fix the 404 / page not found errors when you deactivate the AMP plugin.
Step #1: Download the free plugin called Redirection By John Godley
Step #2: After Activating go to WordPress Dashboard->Tools->Redirection and Setup new redirection.
To setup new redirection, we need to setup 2 things Source URL and Target URL
So in the source URL paste this regex code.
This code will make sure all your post URL ending with /AMP are taken as Source URL and will be redirected.
In the target, URL paste this
https://www.yourdomain.com/$1 and make sure you enable the checkbox “Regular Expression”.
Step #3: Hit Add Redirection and test it.
I suggest you to please check multiple amp pages and make sure they are working as expected.
I hope this will help you handling 404 pages generated after deactivating the AMP plugin, and I’m sure after some time Google will update its data in search console and /amp pages will be deindexed slowly.
If you have any questions or have suggestions please feel free to leave a comment and I will get back to you.