When you create a staging site, WP STAGING plugin will add the line
define( 'JETPACK_STAGING_MODE', true ); automatically to wp-config.php of the staging site. That will enable Jetpack staging mode.
While Jetpack is in Staging Mode, your staging site will act as your production site in nearly all ways except no data is passed up to WordPress.com, and you cannot disconnect Jetpack from the staging site.
If you even want to make use of the Jetpack features on your staging site, you need to allow Jetpack accessing the staging site in WP STAGING by either disabling the WP STAGING Plugin on the staging site or by disabling the authentication option on the staging site as shown below:
The single steps are:
– Disable access permission in WP STAGING plugin.
– Connect Jetpack to your account.
– Re-enable access permission in WP STAGING plugin.
Jetpack is enabled on your staging site now.