Jetpack by WordPress.com is a great plugin for your wordpress site. This plugin has many free inbuilt features like Stats, Publicize, Social Sharing, Photon and more.
When you move to HTTP -> HTTPS, you will face this problem on activating recommended features for this plugin.
"Recommended features failed to activate. TypeError: Failed to fetch"
Check the Screenshot below:
How to fix this error?
You can easily fix this error by changing the wordpress & site adress url to “https” in settings.
Go to Settings -> General
In Genral settings page, you will be able to see the WordPress Address (URL) and Site Address (URL). Both the address will be different from your browser address, check the screen shot below.
Now just change the http to https in both address url and save changes. check the screenshot below.
That’s it. Now go to jetpack and activate the recommended features.